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This PR fixes a runtime error caused when loading images with an alpha channel (RGBA).
Previously, RGBA images led to a channel mismatch error in the model:

RuntimeError: Given groups=1, weight of size [128, 3, 3, 3], 
expected input[1, 4, 512, 512] to have 3 channels, but got 4 channels instead

Changes
Added .convert("RGB") before resizing input images:
pil_img_cond = Image.open(img_path).convert("RGB").resize((512, 512))

Reason
Ensures all input images have 3 channels (RGB), preventing channel mismatch during convolution.

Test
Verified with RGBA images: model now runs without error.
Confirmed RGB images remain unaffected.

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