Incorrect colors in PNG thumbnail of SVG file with mix-blend-mode
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	nclm
	Jul 13 2023, 5:35 AM

Description

Steps to replicate the issue

Upload a SVG on Commons using style="mix-blend-mode:screen" on some objects. For instance https://upload.wikimedia.org/wikipedia/commons/2/2f/Thunderbird_2023_icon.svg
Look at how the SVG is rendered when converted to PNG. For instance https://upload.wikimedia.org/wikipedia/commons/thumb/archive/2/2f/20230712182608%21Thunderbird_2023_icon.svg/120px-Thunderbird_2023_icon.svg.png

What happens?:
The blending mode seem ignored. For instance in the case of that file, the shading isn’t blended with the sames and appear as an opaque purple layer on top.

What should have happened instead?:
The blending mode should be applied.

Event Timeline

nclm created this task.Jul 13 2023, 5:35 AM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptJul 13 2023, 5:36 AM

Cannot reproduce locally with a non-ancient librsvg version (2.56.3). Might get fixed once Wikimedia servers get upgraded to some non-ancient versions...

Aklapper renamed this task from SVG render issue with mix-blend-mode to Incorrect colors in PNG thumbnail of SVG file with mix-blend-mode.Aug 6 2023, 10:05 AM

mix-blend-mode is not part of the current SVG 1.1-Secifications, therefore ignoring is imho technically correct, see also https://github.com/RazrFalcon/resvg/issues/240#issuecomment-592200025 or https://github.com/RazrFalcon/resvg/issues/243#issuecomment-592811200

FYI, the 17:41, 9 August 2023 version of http://commons.wikimedia.org/wiki/File:CMYK_screen_angles.svg is also affected.

Incorrect colors in PNG thumbnail of SVG file with mix-blend-modeClosed, InvalidPublicBUG REPORTActions

Description

Event Timeline

Incorrect colors in PNG thumbnail of SVG file with mix-blend-mode
Closed, InvalidPublicBUG REPORT
Actions