Issue 628 in webp: artefact in reducewebp

ste.k… via monorail

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Jan 21, 2024, 7:12:56 AMJan 21

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Status: New
Owner: ----
Labels: Type-Defect Priority-Medium

New issue 628 by ste.k...@gmail.com: artefact in reducewebp
https://bugs.chromium.org/p/webp/issues/detail?id=628

What steps will reproduce the problem?
1. i reduce with imagick all frame of this file https://www.kinipix.com/291/uzumaki.webp with imagick
2. i obtain this file https://www.kinipix.com/291-small_default/uzumaki.webp

we can see white artefact on one single frame on navigator
but none on gimp

What version of the product are you using? On what operating system?
i use PHP Version 8.3.2 on centos 9 stream 
imagick module version	3.7.0
i try to recompresse it with >webpmux.exe 1.3.2 without success

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ste.k… via monorail

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Jan 21, 2024, 7:15:44 AMJan 21

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Comment #1 on issue 628 by ste.k...@gmail.com: artefact in reducewebp
https://bugs.chromium.org/p/webp/issues/detail?id=628#c1

(No comment was entered for this change.)

Attachments:
	NARUTO-01.webp  1.7 MB
	289-large_default-.webp  763 KB
	289-large_default.webp  763 KB

vrab… via monorail

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Jan 22, 2024, 9:14:46 AMJan 22

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Comment #2 on issue 628 by vra...@google.com: artefact in reducewebp
https://bugs.chromium.org/p/webp/issues/detail?id=628#c2

I first thought this was like https://github.com/ImageMagick/ImageMagick/issues/5542 but compiling it locally, I can still reproduce the bug with ImageMagick 7.1.1-28 (Beta) (git sha1 1aa50ea3c7683c40b5ccd6af308d40d7dca04e15).
I believe you should open up a bug on their GitHub.

vrab… via monorail

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Jan 22, 2024, 9:32:46 AMJan 22

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Comment #3 on issue 628 by vra...@google.com: artefact in reducewebp
https://bugs.chromium.org/p/webp/issues/detail?id=628#c3

Doing
convert uzumaki.webp -coalesce -resize 69x98 uzumaki_resized.webp
does work though

ygu… via monorail

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Jan 22, 2024, 9:33:53 AMJan 22

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Updates:
	Status: Accepted

Comment #4 on issue 628 by ygu...@google.com: artefact in reducewebp
https://bugs.chromium.org/p/webp/issues/detail?id=628#c4

I see https://www.php.net/manual/en/imagick.coalesceimages.php exists. Could that be a workaround in your case?

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