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retain alpha in pil_resize backport #1619

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Kohya S
2024-09-23 21:14:03 +09:00
parent 0b7927e50b
commit 29177d2f03
1 changed files with 11 additions and 4 deletions
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11
library/utils.py
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@@ -83,12 +83,19 @@ def setup_logging(args=None, log_level=None, reset=False):
def pil_resize(image, size, interpolation=Image.LANCZOS):
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
# 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