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Retain alpha in pil_resize for --alpha_mask #1619

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merged 2 commits into from
Sep 20, 2024
Merged

Retain alpha in pil_resize for --alpha_mask #1619

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3957372
Retain alpha in `pil_resize`
emcmanus Sep 19, 2024
de4bb65
Update utils.py
emcmanus Sep 19, 2024
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15 changes: 11 additions & 4 deletions library/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -305,13 +305,20 @@ def _convert_float8(byte_tensor, dtype_str, shape):
raise ValueError(f"Unsupported float8 type: {dtype_str} (upgrade PyTorch to support float8 types)")

def pil_resize(image, size, interpolation=Image.LANCZOS):
pil_image = Image.fromarray(cv2.cvtColor(image, cv2.COLOR_BGR2RGB))
has_alpha = image.shape[2] == 4 if len(image.shape) == 3 else False

if has_alpha:
pil_image = Image.fromarray(cv2.cvtColor(image, cv2.COLOR_BGRA2RGBA))
else:
pil_image = Image.fromarray(cv2.cvtColor(image, cv2.COLOR_BGR2RGB))

# use Pillow resize
resized_pil = pil_image.resize(size, interpolation)

# return cv2 image
resized_cv2 = cv2.cvtColor(np.array(resized_pil), cv2.COLOR_RGB2BGR)
# Convert back to cv2 format
if has_alpha:
resized_cv2 = cv2.cvtColor(np.array(resized_pil), cv2.COLOR_RGBA2BGRA)
else:
resized_cv2 = cv2.cvtColor(np.array(resized_pil), cv2.COLOR_RGB2BGR)

return resized_cv2

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