XnConvert 1.77 - Change color depth bug?

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cday
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XnConvert 1.77 - Change color depth bug?

Post 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...
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xnview
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Re: XnConvert 1.77 - Change color depth bug?

Post by xnview »

what's the problem?
Pierre.
cday
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Re: XnConvert 1.77 - Change color depth bug?

Post 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
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xnview
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Re: XnConvert 1.77 - Change color depth bug?

Post by xnview »

i can't reproduce, could you send me output files?
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cday
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Re: XnConvert 1.77 - Change color depth bug?

Post 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

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?
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