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[image processing] Grayscale photos + watermarks + IM 6.7 = altered contrast #320

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opened 2026-10-04 23:52:00 +02:00 by adam · 1 comment
adam commented 2026-10-04 23:52:00 +02:00
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Reported by plg on 31 Mar 2015 09:27

Version: 2.7.5

See details on http://piwigo.org/forum/viewtopic.php?id=25043

Piwigo Bugtracker #3215

**Reported by plg on 31 Mar 2015 09:27** **Version:** 2.7.5 See details on http://piwigo.org/forum/viewtopic.php?id=25043 [Piwigo Bugtracker #3215](http://piwigo.org/bugs/view.php?id=3215) <!-- github-sync-id:97252325 -->
adam closed this issue 2026-10-04 23:52:00 +02:00
adam commented 2026-10-04 23:52:01 +02:00
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Actually the problem no longer exists with ImageMagick 6.8.9 (Debian 8).

On IM 6.7.7, if I add "-colorspace RGB" for the "compose" (watermark) on a photo that is already RGB, it darkens the watermarked photo. The only way to do it correctly would be to first "detect" the colorspace (grayscale or not) to use the appropriate option. It is too complicated to fix a problem due to ImageMgick, solved in recent version.

Actually the problem no longer exists with ImageMagick 6.8.9 (Debian 8). On IM 6.7.7, if I add "-colorspace RGB" for the "compose" (watermark) on a photo that is already RGB, it darkens the watermarked photo. The only way to do it correctly would be to first "detect" the colorspace (grayscale or not) to use the appropriate option. It is too complicated to fix a problem due to ImageMgick, solved in recent version. <!-- github-comment-id:183964049 -->
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Reference: adam/Piwigo#320