Add native transparent PNG workflow and exact repeated-prompt encoder reuse with paired RGBA quality and timing evidence
371818e verified | """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 | |