saturation increase makes pixelated colours

Bugs which have been reproduced by a second user or the developer

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quapurna
Posts: 127
Joined: Wed Jun 12, 2013 4:55 pm
Location: earth (the not-flat one)

saturation increase makes pixelated colours

Post by quapurna » Sat May 04, 2019 9:00 pm

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xnviewmp: XnView MP Linux, Ver. 0.93.1 64bits (Mar 7 2019)
gimp: 2.8.22
OS: Ubuntu Mate, 18.04.2 (KL 4.15.0-48-generic x86_64)
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If I use xnviewmp to increase the saturation of an image, it is very frequent that some pixelated colours appear.
However, it never happens if I use gimp. The colours spread smoothly.

Please, see the (jpg) images below.

Is there any setting in xnviewmp I should change ?

Thank you.



image 1: original image
duck1-original.jpg
duck1-original.jpg (50.12 KiB) Viewed 146 times


image 2: xnviewmp, saturation increased to 50
duck2-xnviewmp-sat50.jpg
duck2-xnviewmp-sat50.jpg (70.94 KiB) Viewed 146 times


image 3: xnviewmp, saturation increased to 100
duck3-xnviewmp-sat100.jpg
duck3-xnviewmp-sat100.jpg (82.16 KiB) Viewed 146 times


image 4: gimp, saturation increased to 50
duck4-gimp-sat50.jpg
duck4-gimp-sat50.jpg (60.75 KiB) Viewed 146 times


image 5: gimp, saturation increased to 100
duck5-gimp-sat100.jpg
duck5-gimp-sat100.jpg (66.82 KiB) Viewed 146 times



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xnview
Author of XnView
Posts: 31372
Joined: Mon Oct 13, 2003 7:31 am
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Re: saturation increase makes pixelated colours

Post by xnview » Mon May 06, 2019 8:51 am

:bugconfirmed: Thanks to your detailed description I can reproduce
Pierre.

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