some changes

Signed-off-by: Balazs Horvath <acsipont@gmail.com>

.gitmodules

@@ -1,3 +1,3 @@
 [submodule "dataset-tools"]
 	path = dataset-tools
-	url = https://github.com/ka-de/dataset-tools
+	url = git@github.com:ka-de/dataset-tools

dataset-tools

@@ -1 +1 @@
-Subproject commit 0af984140656aa40d830d3317fc6c00ac0fc9ba3
+Subproject commit a8c787494826e9ae2d1e386be8ce304eafb3a0e6

utils/crc32.py

@@ -0,0 +1,18 @@
+import zlib
+import sys
+
+def calculate_crc32(file_path):
+    with open(file_path, 'rb') as file:
+        data = file.read()
+        crc32_checksum = zlib.crc32(data)
+        return crc32_checksum
+
+if __name__ == "__main__":
+    if len(sys.argv) != 2:
+        print("Usage: python script.py <file_path>")
+        sys.exit(1)
+
+    file_path = sys.argv[1]
+    checksum = calculate_crc32(file_path)
+    print(f"CRC32 checksum of {file_path}: {checksum:#010x}")
+

utils/remove_letterbox.py

@@ -0,0 +1,42 @@
+import os
+import sys
+from PIL import Image, ImageChops
+import pillow_jxl
+
+def remove_letterbox(image_path):
+    with Image.open(image_path) as img:
+        # Convert image to RGB if it's not already
+        img = img.convert("RGB")
+        # Create a black image of the same size
+        black = Image.new("RGB", img.size, (0, 0, 0))
+        # Find the bounding box of the non-black regions
+        diff = ImageChops.difference(img, black)
+        bbox = diff.getbbox()
+        if bbox:
+            # Crop the image to the bounding box
+            img = img.crop(bbox)
+            img.save(image_path)
+            print(f"Processed: {image_path}")
+        else:
+            print(f"No letterboxing found in: {image_path}")
+
+def process_directory(directory):
+    for root, _, files in os.walk(directory):
+        for file in files:
+            if file.lower().endswith(('.png', '.jpg', '.jpeg', '.jxl')):
+                remove_letterbox(os.path.join(root, file))
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print("Usage: python remove_letterbox.py <image_or_directory>")
+        sys.exit(1)
+
+    target_path = sys.argv[1]
+    if os.path.isdir(target_path):
+        process_directory(target_path)
+    elif os.path.isfile(target_path):
+        remove_letterbox(target_path)
+    else:
+        print(f"Invalid path: {target_path}")
+        sys.exit(1)
+