Crops out all parts of the image that are not transparent using python and pil. If transparency was the ocean and blobs of opaque pixels were islands, it would create a new image of each island.

cut_out_opaque_parts_of_image_into_smaller_images.py

from PIL import Image

def find_islands(image):
    """Find islands (cards) in the image."""
    width, height = image.size
    pixels = image.load()
    visited = set()
    islands = []

    def is_transparent(x, y):
        return pixels[x, y][3] == 0

    for x in range(width):
        for y in range(height):
            if not is_transparent(x, y) and (x, y) not in visited:
                island = {'left': x, 'right': x, 'top': y, 'bottom': y}
                stack = [(x, y)]
                while stack:
                    cx, cy = stack.pop()
                    if (cx, cy) in visited:
                        continue
                    visited.add((cx, cy))
                    island['left'] = min(island['left'], cx)
                    island['right'] = max(island['right'], cx)
                    island['top'] = min(island['top'], cy)
                    island['bottom'] = max(island['bottom'], cy)
                    for dx, dy in [(0, 1), (1, 0), (0, -1), (-1, 0)]:
                        nx, ny = cx + dx, cy + dy
                        if 0 <= nx < width and 0 <= ny < height and not is_transparent(nx, ny):
                            stack.append((nx, ny))
                islands.append(island)

    return islands

def crop_islands(image, islands):
    """Crop each island (card) from the image."""
    cropped_images = []
    for island in islands:
        cropped = image.crop((island['left'], island['top'], island['right'] + 1, island['bottom'] + 1))
        cropped_images.append(cropped)
    return cropped_images

# Load the image
image_path = "objective_cards.png"  # Replace with your image path
image = Image.open(image_path)

# Find islands (cards)
islands = find_islands(image)

# Crop islands (cards)
cropped_images = crop_islands(image, islands)

# Save cropped images
for idx, img in enumerate(cropped_images):
    img.save(f"cropped_card_{idx}.png")