Fix: introduces the verification of the python installation (#1730)

* Fix: introduces the verification of the python installation

* Update ExtractImageScansController.java

* Update CheckProgramInstall.java

src/main/java/stirling/software/SPDF/controller/api/converters/ConvertImgPDFController.java

@@ -7,7 +7,6 @@ import java.net.URLConnection;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.List;
 import java.util.stream.Collectors;
 import java.util.zip.ZipEntry;
@@ -17,7 +16,6 @@ import org.apache.commons.io.FileUtils;
 import org.apache.pdfbox.rendering.ImageType;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import org.springframework.http.HttpHeaders;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.ModelAttribute;
@@ -32,6 +30,7 @@ import io.swagger.v3.oas.annotations.tags.Tag;
 
 import stirling.software.SPDF.model.api.converters.ConvertToImageRequest;
 import stirling.software.SPDF.model.api.converters.ConvertToPdfRequest;
+import stirling.software.SPDF.utils.CheckProgramInstall;
 import stirling.software.SPDF.utils.PdfUtils;
 import stirling.software.SPDF.utils.ProcessExecutor;
 import stirling.software.SPDF.utils.ProcessExecutor.ProcessExecutorResult;
@@ -82,7 +81,10 @@ public class ConvertImgPDFController {
         if (result == null || result.length == 0) {
             logger.error("resultant bytes for {} is null, error converting ", filename);
         }
-        if (imageFormat.equalsIgnoreCase("webp")) {
+        if (imageFormat.equalsIgnoreCase("webp") && !CheckProgramInstall.isPythonAvailable()) {
+            throw new IOException("Python is not installed. Required for WebP conversion.");
+        } else if (imageFormat.equalsIgnoreCase("webp")
+                && CheckProgramInstall.isPythonAvailable()) {
             // Write the output stream to a temp file
             Path tempFile = Files.createTempFile("temp_png", ".png");
             try (FileOutputStream fos = new FileOutputStream(tempFile.toFile())) {
@@ -90,21 +92,13 @@ public class ConvertImgPDFController {
                 fos.flush();
             }
 
-            String pythonVersion = "python3";
+            String pythonVersion = CheckProgramInstall.getAvailablePythonCommand();
-            try {
-                ProcessExecutor.getInstance(ProcessExecutor.Processes.PYTHON_OPENCV)
-                        .runCommandWithOutputHandling(Arrays.asList("python3", "--version"));
-            } catch (IOException e) {
-                ProcessExecutor.getInstance(ProcessExecutor.Processes.PYTHON_OPENCV)
-                        .runCommandWithOutputHandling(Arrays.asList("python", "--version"));
-                pythonVersion = "python";
-            }
 
             List<String> command = new ArrayList<>();
             command.add(pythonVersion);
             command.add("./scripts/png_to_webp.py"); // Python script to handle the conversion
 
-                // Create a temporary directory for the output WebP files
+            // Create a temporary directory for the output WebP files
             Path tempOutputDir = Files.createTempDirectory("webp_output");
             if (singleImage) {
                 // Run the Python script to convert PNG to WebP

src/main/java/stirling/software/SPDF/controller/api/misc/ExtractImageScansController.java

@@ -32,6 +32,7 @@ import io.swagger.v3.oas.annotations.parameters.RequestBody;
 import io.swagger.v3.oas.annotations.tags.Tag;
 
 import stirling.software.SPDF.model.api.misc.ExtractImageScansRequest;
+import stirling.software.SPDF.utils.CheckProgramInstall;
 import stirling.software.SPDF.utils.ProcessExecutor;
 import stirling.software.SPDF.utils.ProcessExecutor.ProcessExecutorResult;
 import stirling.software.SPDF.utils.WebResponseUtils;
@@ -76,6 +77,11 @@ public class ExtractImageScansController {
         Path tempZipFile = null;
         List<Path> tempDirs = new ArrayList<>();
 
+        if (!CheckProgramInstall.isPythonAvailable()) {
+            throw new IOException("Python is not installed.");
+        }
+
+        String pythonVersion = CheckProgramInstall.getAvailablePythonCommand();
         try {
             // Check if input file is a PDF
             if ("pdf".equalsIgnoreCase(extension)) {
@@ -117,7 +123,7 @@ public class ExtractImageScansController {
                 List<String> command =
                         new ArrayList<>(
                                 Arrays.asList(
-                                        "python3",
+                                        pythonVersion,
                                         "./scripts/split_photos.py",
                                         images.get(i),
                                         tempDir.toString(),

src/main/java/stirling/software/SPDF/controller/api/misc/ExtractImagesController.java

@@ -140,9 +140,9 @@ public class ExtractImagesController {
             Set<Integer> processedImages,
             ZipOutputStream zos)
             throws IOException {
-        if(page.getResources() == null || page.getResources().getXObjectNames() == null) {
+        if (page.getResources() == null || page.getResources().getXObjectNames() == null) {
-    		return;
+            return;
-    	}
+        }
         for (COSName name : page.getResources().getXObjectNames()) {
             if (page.getResources().isImageXObject(name)) {
                 PDImageXObject image = (PDImageXObject) page.getResources().getXObject(name);

src/main/java/stirling/software/SPDF/controller/web/ConverterWebController.java

@@ -9,6 +9,8 @@ import org.springframework.web.servlet.ModelAndView;
 import io.swagger.v3.oas.annotations.Hidden;
 import io.swagger.v3.oas.annotations.tags.Tag;
 
+import stirling.software.SPDF.utils.CheckProgramInstall;
+
 @Controller
 @Tag(name = "Convert", description = "Convert APIs")
 public class ConverterWebController {
@@ -69,6 +71,8 @@ public class ConverterWebController {
     @GetMapping("/pdf-to-img")
     @Hidden
     public String pdfToimgForm(Model model) {
+        boolean isPython = CheckProgramInstall.isPythonAvailable();
+        model.addAttribute("isPython", isPython);
         model.addAttribute("currentPage", "pdf-to-img");
         return "convert/pdf-to-img";
     }

src/main/java/stirling/software/SPDF/controller/web/OtherWebController.java

@@ -16,6 +16,7 @@ import io.swagger.v3.oas.annotations.Hidden;
 import io.swagger.v3.oas.annotations.tags.Tag;
 
 import stirling.software.SPDF.model.ApplicationProperties;
+import stirling.software.SPDF.utils.CheckProgramInstall;
 
 @Controller
 @Tag(name = "Misc", description = "Miscellaneous APIs")
@@ -34,6 +35,8 @@ public class OtherWebController {
     @Hidden
     public ModelAndView extractImageScansForm() {
         ModelAndView modelAndView = new ModelAndView("misc/extract-image-scans");
+        boolean isPython = CheckProgramInstall.isPythonAvailable();
+        modelAndView.addObject("isPython", isPython);
         modelAndView.addObject("currentPage", "extract-image-scans");
         return modelAndView;
     }

src/main/java/stirling/software/SPDF/utils/CheckProgramInstall.java

@@ -0,0 +1,59 @@
+package stirling.software.SPDF.utils;
+
+import java.io.IOException;
+import java.util.Arrays;
+import java.util.List;
+
+import stirling.software.SPDF.utils.ProcessExecutor.ProcessExecutorResult;
+
+public class CheckProgramInstall {
+
+    private static final List<String> PYTHON_COMMANDS = Arrays.asList("python3", "python");
+    private static boolean pythonAvailableChecked = false;
+    private static String availablePythonCommand = null;
+
+    /**
+     * Checks which Python command is available and returns it.
+     *
+     * @return The available Python command ("python3" or "python"), or null if neither is
+     *     available.
+     */
+    public static String getAvailablePythonCommand() {
+        if (!pythonAvailableChecked) {
+            availablePythonCommand =
+                    PYTHON_COMMANDS.stream()
+                            .filter(CheckProgramInstall::checkPythonVersion)
+                            .findFirst()
+                            .orElse(null);
+            pythonAvailableChecked = true;
+        }
+        return availablePythonCommand;
+    }
+
+    /**
+     * Checks if the specified command is available by running the command with --version.
+     *
+     * @param pythonCommand The Python command to check.
+     * @return true if the command is available, false otherwise.
+     */
+    private static boolean checkPythonVersion(String pythonCommand) {
+        try {
+            ProcessExecutorResult result =
+                    ProcessExecutor.getInstance(ProcessExecutor.Processes.PYTHON_OPENCV)
+                            .runCommandWithOutputHandling(
+                                    Arrays.asList(pythonCommand, "--version"));
+            return true; // Command succeeded, Python is available
+        } catch (IOException | InterruptedException e) {
+            return false; // Command failed, Python is not available
+        }
+    }
+
+    /**
+     * Checks if any Python command is available.
+     *
+     * @return true if any Python command is available, false otherwise.
+     */
+    public static boolean isPythonAvailable() {
+        return getAvailablePythonCommand() != null;
+    }
+}

src/main/resources/messages_ar_AR.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=الحد الأدنى لمنطقة المحيط:
 ScannerImageSplit.selectText.8=تعيين الحد الأدنى لمنطقة المحيط للصورة
 ScannerImageSplit.selectText.9=حجم الحدود:
 ScannerImageSplit.selectText.10=يضبط حجم الحدود المضافة والمزالة لمنع الحدود البيضاء في الإخراج (الافتراضي: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=اللون
 pdfToImage.grey=تدرج الرمادي
 pdfToImage.blackwhite=أبيض وأسود (قد يفقد البيانات!)
 pdfToImage.submit=تحول
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_bg_BG.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Минимална контурна площ:
 ScannerImageSplit.selectText.8=Задава минималния праг на контурната площ за изображение
 ScannerImageSplit.selectText.9=Размер на рамката:
 ScannerImageSplit.selectText.10=Задава размера на добавената и премахната граница, за да предотврати бели граници към изхода (по подразбиране: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Цвят
 pdfToImage.grey=Скала на сивото
 pdfToImage.blackwhite=Черно и бяло (може да загубите данни!)
 pdfToImage.submit=Преобразуване
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_ca_CA.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Àrea de contorn mínima:
 ScannerImageSplit.selectText.8=Estableix el llindar mínim de l'àrea de contorn per a una foto
 ScannerImageSplit.selectText.9=Mida Vora:
 ScannerImageSplit.selectText.10=Estableix la mida de la vora afegida i eliminada per evitar vores blanques a la sortida (per defecte: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Color
 pdfToImage.grey=Escala de Grisos
 pdfToImage.blackwhite=Blanc i Negre (Pot perdre dades!)
 pdfToImage.submit=Converteix
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_cs_CZ.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Minimální plocha kontury:
 ScannerImageSplit.selectText.8=Nastaví minimální plošný práh kontury pro fotografii
 ScannerImageSplit.selectText.9=Velikost okraje:
 ScannerImageSplit.selectText.10=Nastaví velikost okraje přidaného a odebraného k zabránění bílých ohraničení ve výstupu (výchozí: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Barevný
 pdfToImage.grey=Stupně šedi
 pdfToImage.blackwhite=Černobílý (Může dojít k ztrátě dat!)
 pdfToImage.submit=Převést
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_da_DK.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Minimum Contour Area:
 ScannerImageSplit.selectText.8=Sets the minimum contour area threshold for a photo
 ScannerImageSplit.selectText.9=Border Size:
 ScannerImageSplit.selectText.10=Sets the size of the border added and removed to prevent white borders in the output (default: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Colour
 pdfToImage.grey=Greyscale
 pdfToImage.blackwhite=Black and White (May lose data!)
 pdfToImage.submit=Convert
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_de_DE.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Minimaler Konturbereich:
 ScannerImageSplit.selectText.8=Legt den minimalen Konturbereichsschwellenwert für ein Foto fest
 ScannerImageSplit.selectText.9=Randgröße:
 ScannerImageSplit.selectText.10=Legt die Größe des hinzugefügten und entfernten Randes fest, um weiße Ränder in der Ausgabe zu verhindern (Standard: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Farbe
 pdfToImage.grey=Graustufen
 pdfToImage.blackwhite=Schwarzweiß (Datenverlust möglich!)
 pdfToImage.submit=Umwandeln
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_el_GR.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Ελάχιστη επιφάνεια περιγρ
 ScannerImageSplit.selectText.8=Ρυθμίζει το ελάχιστο όριο περιγράμματος για μια φωτογραφία
 ScannerImageSplit.selectText.9=Μέγεθος περιγράμματος:
 ScannerImageSplit.selectText.10=Ορίζει το μέγεθος του περιγράμματος που προστίθεται και αφαιρείται για να αποτρέπονται λευκά περιγράμματα στην έξοδο (προεπιλογή: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Χρώμα
 pdfToImage.grey=Κλίμακα του γκρι
 pdfToImage.blackwhite=Ασπρόμαυρο (Μπορεί να χαθούν δεδομένα!)
 pdfToImage.submit=Μετατροπή
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_en_GB.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Minimum Contour Area:
 ScannerImageSplit.selectText.8=Sets the minimum contour area threshold for a photo
 ScannerImageSplit.selectText.9=Border Size:
 ScannerImageSplit.selectText.10=Sets the size of the border added and removed to prevent white borders in the output (default: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Colour
 pdfToImage.grey=Greyscale
 pdfToImage.blackwhite=Black and White (May lose data!)
 pdfToImage.submit=Convert
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_en_US.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Minimum Contour Area:
 ScannerImageSplit.selectText.8=Sets the minimum contour area threshold for a photo
 ScannerImageSplit.selectText.9=Border Size:
 ScannerImageSplit.selectText.10=Sets the size of the border added and removed to prevent white borders in the output (default: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Color
 pdfToImage.grey=Grayscale
 pdfToImage.blackwhite=Black and White (May lose data!)
 pdfToImage.submit=Convert
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_es_ES.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Área mínima de contorno:
 ScannerImageSplit.selectText.8=Establecer el umbral mínimo del área de contorno para una foto
 ScannerImageSplit.selectText.9=Tamaño del borde:
 ScannerImageSplit.selectText.10=Establece el tamaño del borde agregado y eliminado para evitar bordes blancos en la salida (predeterminado: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Color
 pdfToImage.grey=Escala de grises
 pdfToImage.blackwhite=Blanco y Negro (¡Puede perder datos!)
 pdfToImage.submit=Convertir
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_eu_ES.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Inguruko area gutxienekoa:
 ScannerImageSplit.selectText.8=Ezarri inguruko arearen gutxieneko balioa argazki batentzat
 ScannerImageSplit.selectText.9=Ertzaren tamaina:
 ScannerImageSplit.selectText.10=Ezarri gehitutako eta ezabatutako ertzaren tamaina irteeran ertz zuriak saihesteko (lehenetsia: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Kolorea
 pdfToImage.grey=Gris-eskala
 pdfToImage.blackwhite=Zuria eta Beltza (Datuak galdu ditzake!)
 pdfToImage.submit=Bihurtu
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_fr_FR.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Surface de contour minimale
 ScannerImageSplit.selectText.8=Définit la surface de contour minimale pour une photo (par défaut : 500).
 ScannerImageSplit.selectText.9=Taille de la bordure
 ScannerImageSplit.selectText.10=Définit la taille de la bordure ajoutée et supprimée pour éviter les bordures blanches dans la sortie (par défaut : 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Couleur
 pdfToImage.grey=Niveaux de gris
 pdfToImage.blackwhite=Noir et blanc (peut engendrer une perte de données !)
 pdfToImage.submit=Convertir
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_ga_IE.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Íos-Limistéar Comhrianta:
 ScannerImageSplit.selectText.8=Socraíonn sé an tairseach íosta achar comhrianta le haghaidh grianghraf
 ScannerImageSplit.selectText.9=Méid na Teorann:
 ScannerImageSplit.selectText.10=Socraíonn sé méid na teorann a chuirtear leis agus a bhaintear chun teorainneacha bán a chosc san aschur (réamhshocraithe: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Dath
 pdfToImage.grey=Scála Liath
 pdfToImage.blackwhite=Dubh agus Bán (D’fhéadfadh sonraí a chailleadh!)
 pdfToImage.submit=Tiontaigh
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_hi_IN.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=न्यूनतम कंटोर क्ष
 ScannerImageSplit.selectText.8=फोटो के लिए न्यूनतम कंटोर क्षेत्र थ्रेशोल्ड को सेट करता है।
 ScannerImageSplit.selectText.9=बॉर्डर का आकार:
 ScannerImageSplit.selectText.10=निकालने और जोड़ने के लिए जोड़ा जाने वाला बॉर्डर का आकार सेट करता है ताकि आउटपुट में सफेद बॉर्डर न आए (डिफ़ॉल्ट: 1)।
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=रंगीन
 pdfToImage.grey=ग्रे स्केल
 pdfToImage.blackwhite=काला और सफेद (डेटा खो सकता है!)
 pdfToImage.submit=परिवर्तित करें
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_hr_HR.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Minimalna konturna površina:
 ScannerImageSplit.selectText.8=Postavlja minimalni prag površine konture za fotografiju
 ScannerImageSplit.selectText.9=Veličina obruba:
 ScannerImageSplit.selectText.10=Postavlja veličinu obruba koji se dodaje i uklanja kako bi se spriječili bijeli obrubi u ispisu (zadano: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Boja
 pdfToImage.grey=Sivi tonovi
 pdfToImage.blackwhite=Crno-bijelo (mogu se izgubiti podaci!)
 pdfToImage.submit=Pretvori
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_hu_HU.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Minimális kontúr terület:
 ScannerImageSplit.selectText.8=A fotók minimális kontúrterületének beállítása
 ScannerImageSplit.selectText.9=Keret mérete:
 ScannerImageSplit.selectText.10=A hozzáadott és eltávolított keret méretének beállítása a fehér keretek elkerülése érdekében a kimeneten (alapértelmezett: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=színes
 pdfToImage.grey=szürkeárnyalatos
 pdfToImage.blackwhite=fekete-fehér (adatvesztéssel járhat!)
 pdfToImage.submit=Átalakítás
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_id_ID.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Area Kontur Minimum:
 ScannerImageSplit.selectText.8=Menetapkan ambang batas area kontur minimum untuk foto
 ScannerImageSplit.selectText.9=Ukuran Batas:
 ScannerImageSplit.selectText.10=Menetapkan ukuran batas yang ditambahkan dan dihapus untuk mencegah batas putih pada output (default: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Warna
 pdfToImage.grey=Skala abu-abu
 pdfToImage.blackwhite=Black and White (Bisa kehilangan data!)
 pdfToImage.submit=Konversi
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_it_IT.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Area di contorno minima:
 ScannerImageSplit.selectText.8=Imposta l'area minima del contorno di una foto
 ScannerImageSplit.selectText.9=Spessore bordo:
 ScannerImageSplit.selectText.10=Imposta lo spessore del bordo aggiunto o rimosso per prevenire bordi bianchi nel risultato (predefinito: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=A colori
 pdfToImage.grey=Scala di grigi
 pdfToImage.blackwhite=Bianco e Nero (potresti perdere dettagli!)
 pdfToImage.submit=Converti
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_ja_JP.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=最小輪郭面積:
 ScannerImageSplit.selectText.8=画像の最小の輪郭面積のしきい値を設定。
 ScannerImageSplit.selectText.9=境界線サイズ:
 ScannerImageSplit.selectText.10=出力に白い縁取りが出ないように追加・削除される境界線の大きさを設定 (初期値:1)。
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=カラー
 pdfToImage.grey=グレースケール
 pdfToImage.blackwhite=白黒 (データが失われる可能性があります！)
 pdfToImage.submit=変換
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_ko_KR.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=최소 윤곽 영역:
 ScannerImageSplit.selectText.8=사진의 최소 윤곽선 영역 임계값을 설정합니다.
 ScannerImageSplit.selectText.9=테두리 크기:
 ScannerImageSplit.selectText.10=출력에서 흰색 테두리를 방지하기 위해 추가 및 제거되는 테두리의 크기를 설정합니다(기본값: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=컬러
 pdfToImage.grey=그레이스케일
 pdfToImage.blackwhite=흑백 (데이터 손실 가능성 있음!)
 pdfToImage.submit=변환
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_nl_NL.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Minimum contour oppervlakte:
 ScannerImageSplit.selectText.8=Stelt de minimale contour oppervlakte drempel in voor een foto
 ScannerImageSplit.selectText.9=Randgrootte:
 ScannerImageSplit.selectText.10=Stelt de grootte van de toegevoegde en verwijderde rand in om witte randen in de uitvoer te voorkomen (standaard: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Kleur
 pdfToImage.grey=Grijstinten
 pdfToImage.blackwhite=Zwart en wit (kan data verliezen!)
 pdfToImage.submit=Omzetten
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_no_NB.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Minimumskonturområde:
 ScannerImageSplit.selectText.8=Angir minimumskonturområde terskel for et bilde
 ScannerImageSplit.selectText.9=Kantstørrelse:
 ScannerImageSplit.selectText.10=Angir størrelsen på kanten som legges til og fjernes for å forhindre hvite kanter i utdataen (standard: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Farge
 pdfToImage.grey=Gråtone
 pdfToImage.blackwhite=Svart-hvitt (kan miste data!)
 pdfToImage.submit=Konverter
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_pl_PL.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Minimalny obszar konturu:
 ScannerImageSplit.selectText.8=Ustawia próg minimalnego obszaru konturu dla zdjęcia
 ScannerImageSplit.selectText.9=Rozmiar obramowania:
 ScannerImageSplit.selectText.10=Ustawia rozmiar dodawanego i usuwanego obramowania, aby uniknąć białych obramowań na wyjściu (domyślnie: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Kolor
 pdfToImage.grey=Odcień szarości
 pdfToImage.blackwhite=Czarno-biały (może spowodować utratę danych!)
 pdfToImage.submit=Konwertuj
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_pt_BR.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Área mínima de contorno:
 ScannerImageSplit.selectText.8=Define o limite mínimo da área de contorno para uma foto
 ScannerImageSplit.selectText.9=Tamanho da borda:
 ScannerImageSplit.selectText.10=Define o tamanho da borda adicionada e removida para evitar bordas brancas na saída (padrão: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Colorida
 pdfToImage.grey=Escala de Cinza
 pdfToImage.blackwhite=Preto e Branco (pode perder de dados!)
 pdfToImage.submit=Converter
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_pt_PT.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Área mínima de contorno:
 ScannerImageSplit.selectText.8=Define o limite mínimo da área de contorno para uma foto
 ScannerImageSplit.selectText.9=Tamanho do contorno:
 ScannerImageSplit.selectText.10=Define o tamanho do contorno adicionado e removido para evitar contornos brancos na saída (padrão: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Colorida
 pdfToImage.grey=Escala de Cinza
 pdfToImage.blackwhite=Preto e Branco (pode resultar em perda de dados!)
 pdfToImage.submit=Converter
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_ro_RO.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Arie minimă a conturului:
 ScannerImageSplit.selectText.8=Stabilește pragul minim de arie a conturului pentru o fotografie.
 ScannerImageSplit.selectText.9=Mărimea marginii:
 ScannerImageSplit.selectText.10=Stabilește mărimea marginii adăugate și eliminate pentru a evita marginile albe în rezultat (implicit: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Culoare
 pdfToImage.grey=Scală de gri
 pdfToImage.blackwhite=Alb și negru (Poate pierde date!)
 pdfToImage.submit=Convertă
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_ru_RU.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Минимальная площадь конту
 ScannerImageSplit.selectText.8=Устанавливает минимальный порог области контура для фотографии
 ScannerImageSplit.selectText.9=Размер границы:
 ScannerImageSplit.selectText.10=Устанавливает размер добавляемой и удаляемой границы, чтобы предотвратить появление белых границ на выходе (по умолчанию: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Цвет
 pdfToImage.grey=Оттенки серого
 pdfToImage.blackwhite=Черно-белый (может потерять данные!)
 pdfToImage.submit=Конвертировать
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_sk_SK.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Minimálna plocha obrysu:
 ScannerImageSplit.selectText.8=Nastaví minimálnu prahovú hodnotu plochy obrysu pre fotografiu
 ScannerImageSplit.selectText.9=Veľkosť okraja:
 ScannerImageSplit.selectText.10=Nastaví veľkosť okraja pridaného a odstráneného, aby sa zabránilo bielym okrajom vo výstupe (predvolené: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Farba
 pdfToImage.grey=Odtiene šedej
 pdfToImage.blackwhite=Čierno-biele (Môže stratiť údaje!)
 pdfToImage.submit=Konvertovať
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_sr_LATN_RS.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Minimalna površina konture:
 ScannerImageSplit.selectText.8=Postavlja minimalni prag površine konture za fotografiju
 ScannerImageSplit.selectText.9=Veličina ivice:
 ScannerImageSplit.selectText.10=Postavlja veličinu ivice dodate i uklonjene kako bi se sprečile bele ivice u izlazu (podrazumevano: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Boja
 pdfToImage.grey=Nijanse sive
 pdfToImage.blackwhite=Crno-belo (Može izgubiti podatke!)
 pdfToImage.submit=Konvertuj
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_sv_SE.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Minsta konturarea:
 ScannerImageSplit.selectText.8=Ställer in minsta tröskelvärde för konturarea för ett foto
 ScannerImageSplit.selectText.9=Kantstorlek:
 ScannerImageSplit.selectText.10=Ställer in storleken på kanten som läggs till och tas bort för att förhindra vita kanter i utdata (standard: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Färg
 pdfToImage.grey=Gråskala
 pdfToImage.blackwhite=Svartvitt (kan förlora data!)
 pdfToImage.submit=Konvertera
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_th_TH.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=พื้นที่เค้าโครงข
 ScannerImageSplit.selectText.8=ตั้งค่าเกณฑ์พื้นที่เค้าโครงขั้นต่ำสำหรับรูปภาพ
 ScannerImageSplit.selectText.9=ขนาดขอบ:
 ScannerImageSplit.selectText.10=ตั้งค่าขนาดขอบที่เพิ่มและลบเพื่อป้องกันขอบขาวในผลลัพธ์ (ค่าเริ่มต้น: 1)
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=สี
 pdfToImage.grey=ระดับสีเทา
 pdfToImage.blackwhite=ขาวดำ (อาจสูญเสียข้อมูล!)
 pdfToImage.submit=แปลง
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_tr_TR.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Minimum Kontur Alanı:
 ScannerImageSplit.selectText.8=Bir fotoğraf için minimum kontur alanı eşiğini ayarlar
 ScannerImageSplit.selectText.9=Kenar Boyutu:
 ScannerImageSplit.selectText.10=Çıktıda beyaz kenarların önlenmesi için eklenen ve kaldırılan kenarın boyutunu ayarlar (varsayılan: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Renk
 pdfToImage.grey=Gri tonlama
 pdfToImage.blackwhite=Siyah ve Beyaz (Veri kaybolabilir!)
 pdfToImage.submit=Dönüştür
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_uk_UA.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Мінімальна площа контуру:
 ScannerImageSplit.selectText.8=Встановлює мінімальний поріг площі контуру для фотографії
 ScannerImageSplit.selectText.9=Розмір рамки:
 ScannerImageSplit.selectText.10=Встановлює розмір додаваної та видаляної рамки, щоб запобігти появі білих рамок на виході (за замовчуванням: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Колір
 pdfToImage.grey=Відтінки сірого
 pdfToImage.blackwhite=Чорно-білий (може втратити дані!)
 pdfToImage.submit=Конвертувати
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_vi_VN.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=Diện tích đường viền tối thiểu:
 ScannerImageSplit.selectText.8=Đặt ngưỡng diện tích đường viền tối thiểu cho một ảnh
 ScannerImageSplit.selectText.9=Kích thước viền:
 ScannerImageSplit.selectText.10=Đặt kích thước của viền được thêm vào và loại bỏ để ngăn chặn viền trắng trong đầu ra (mặc định: 1).
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=Màu
 pdfToImage.grey=Thang độ xám
 pdfToImage.blackwhite=Đen trắng (Có thể mất dữ liệu!)
 pdfToImage.submit=Chuyển đổi
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_zh_CN.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=最小轮廓面积：
 ScannerImageSplit.selectText.8=设置照片的最小轮廓面积阈值。
 ScannerImageSplit.selectText.9=边框尺寸：
 ScannerImageSplit.selectText.10=设置添加和删除的边框大小，以防止输出中出现白边（默认值：1）。
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=颜色
 pdfToImage.grey=灰度
 pdfToImage.blackwhite=黑白（可能会丢失数据！）。
 pdfToImage.submit=转换
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/messages_zh_TW.properties

@@ -775,6 +775,7 @@ ScannerImageSplit.selectText.7=最小輪廓區域：
 ScannerImageSplit.selectText.8=設定照片的最小輪廓區域閾值
 ScannerImageSplit.selectText.9=邊框大小：
 ScannerImageSplit.selectText.10=設定新增和移除的邊框大小，以防止輸出中的白色邊框（預設：1）。
+ScannerImageSplit.info=Python is not installed. It is required to run.
 
 
 #OCR
@@ -925,6 +926,7 @@ pdfToImage.color=顏色
 pdfToImage.grey=灰度
 pdfToImage.blackwhite=黑白（可能會遺失資料！）
 pdfToImage.submit=轉換
+pdfToImage.info=Python is not installed. Required for WebP conversion.
 
 
 #addPassword

src/main/resources/templates/misc/extract-image-scans.html

@@ -18,7 +18,9 @@
                 <span class="tool-header-text" th:text="#{home.ScannerImageSplit.title}"></span>
               </div>
 
-              <form id="multiPdfForm" th:action="@{'/api/v1/misc/extract-image-scans'}" method="post" enctype="multipart/form-data">
+              <p th:if="${!isPython}" th:text="#{ScannerImageSplit.info}" class="alert alert-success text-center">Python is not installed. It is required to run.</p>
+
+              <form th:if="${isPython}" id="multiPdfForm" th:action="@{'/api/v1/misc/extract-image-scans'}" method="post" enctype="multipart/form-data">
                 <div th:replace="~{fragments/common :: fileSelector(name='fileInput', multiple=false, accept='image/*, application/pdf')}"></div>
                 <div class="mb-3">
                   <label for="angleThreshold" th:text="#{ScannerImageSplit.selectText.1}"></label>