#9872: WebP vs PNG alpha
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Reporter: Jozef | Owner: (none)
Chutka |
Type: defect | Status: new
Priority: normal | Component:
| undetermined
Version: unspecified | Resolution:
Keywords: scale alpha | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by Jozef Chutka):
After some more testing (and updated .webp and .png exports from my
graphic program) it appears the issue not related to webp or pixel format
itself, but rather related to the RGB values of the semi-transparent pixel
and scale filter. While the shape edge is rendered correctly without scale
filter used, once `scale` is used, the alpha of the edge pixels gets
"premultiplied".
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Ticket URL: <https://trac.ffmpeg.org/ticket/9872#comment:6>
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