Changes between Initial Version and Version 1 of Ticket #9872, comment 6


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Timestamp:
Aug 15, 2022, 1:05:07 PM (4 years ago)
Author:
Jozef Chutka

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  • Ticket #9872, comment 6

    initial v1  
    11After 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".
     2
     3Could it be that `scale` filter handles rgb separately from alpha channel, running effectively the scaling algorithm twice and then merging rgb+alpha resulting in alpha artifacts?