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XnConvert 1.77 - Change color depth bug?

Posted: Mon May 06, 2019 8:47 am
by cday
Reducing the color depth of 24-bit JPEGs to 8 colors seems to be broken, the output file has more than 8 colors.

Also in 1.75...

Re: XnConvert 1.77 - Change color depth bug?

Posted: Mon May 06, 2019 11:43 am
by xnview
what's the problem?

Re: XnConvert 1.77 - Change color depth bug?

Posted: Mon May 06, 2019 1:41 pm
by cday
As stated above:

Microsoft standard JPEG Tulips [Attached] --> 99986 unique colors

XnView MP 0.93 Image > Change color depth... -8 -->Output has 8 unique colors :D

XnConvert 1.77 Actions > Change color depth -8 -->Output has 9155 unique colors :(

Am I missing something?


Tulips.zip
(103.72 KiB) Downloaded 14 times

Re: XnConvert 1.77 - Change color depth bug?

Posted: Tue May 07, 2019 5:50 am
by xnview
i can't reproduce, could you send me output files?

Re: XnConvert 1.77 - Change color depth bug?

Posted: Sat May 18, 2019 7:11 pm
by cday
xnview wrote:
Tue May 07, 2019 5:50 am
i can't reproduce, could you send me output files?
Attached, Number of colors shown as 78309...

Retested 1.80 32-bit ZIP on Windows using these settings:


Actions tab.png

Output tab.png

Write Settings.png
Write Settings.png (24.23 KiB) Viewed 150 times

Reducing color depth using XnView MP 0.93 Image > Reduce color depth... with similar settings produces the expected 8 colors.

Am I missing something or is there a bug in XnConvert?