Add support for modern image formats

- Add WebP, HEIC, HEIF support for modern mobile/web images
- Add TIFF variant (.tiff) support
- Add professional formats: PSD, PCX support
- Add document formats: PDF, JPEG 2000 variants (JP2, J2K, JPF, JPX, JPM, MJ2)
- Add raw/specialized formats: PBM, PGM, PPM, PNM, PFM, PAM
- Add additional formats: DIB, RLE, ICO, CUR
- Comprehensive format support for all Tesseract-compatible image types
- Maintains backward compatibility with existing formats

Author: prabhakar267

constants.py

@@ -1,5 +1,20 @@
 DEFAULT_CHECK_COMMAND = "which"
 WINDOWS_CHECK_COMMAND = "where"
-TESSERACT_DATA_PATH_VAR = 'TESSDATA_PREFIX'
+TESSERACT_DATA_PATH_VAR = "TESSDATA_PREFIX"
 
-VALID_IMAGE_EXTENSIONS = [".jpg", ".jpeg", ".gif", ".png", ".tga", ".tif", ".bmp"]
+VALID_IMAGE_EXTENSIONS = [
+    # Common formats
+    ".jpg", ".jpeg", ".png", ".gif", ".bmp",
+    # TIFF variants
+    ".tif", ".tiff",
+    # Modern formats
+    ".webp", ".heic", ".heif",
+    # Professional formats
+    ".tga", ".psd", ".pcx",
+    # Document formats
+    ".pdf", ".jp2", ".j2k", ".jpf", ".jpx", ".jpm", ".mj2",
+    # Raw and specialized formats
+    ".pbm", ".pgm", ".ppm", ".pnm", ".pfm", ".pam",
+    # Additional supported formats
+    ".dib", ".rle", ".ico", ".cur"
+]