File size: 906 Bytes
371818e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | """Native RGBA prompting and lossless alpha reporting. Built with Qwen."""
def transparent_prompt(prompt):
return (prompt.rstrip() + '\nIsolated subject on a transparent background. '
'Preserve natural fine edges and any translucent details in the alpha channel. '
'No opaque backdrop or checkerboard pattern.')
def alpha_statistics(image):
result = {'mode': image.mode, 'has_alpha': 'A' in image.getbands()}
if result['has_alpha']:
alpha = image.getchannel('A')
histogram = alpha.histogram()
total = image.width * image.height
result.update(alpha_min=alpha.getextrema()[0], alpha_max=alpha.getextrema()[1],
transparent_fraction=sum(histogram[:16])/total,
translucent_fraction=sum(histogram[16:240])/total,
opaque_fraction=sum(histogram[240:])/total)
return result
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