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 » Mon May 06, 2019 8:47 am

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 » Mon May 06, 2019 11:43 am

what's the problem?
Pierre.

cday
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Re: XnConvert 1.77 - Change color depth bug?

Post by cday » Mon May 06, 2019 1:41 pm

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 18 times

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xnview
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Re: XnConvert 1.77 - Change color depth bug?

Post by xnview » Tue May 07, 2019 5:50 am

i can't reproduce, could you send me output files?
Pierre.

cday
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Re: XnConvert 1.77 - Change color depth bug?

Post by cday » Sat May 18, 2019 7:11 pm

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 224 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?
Attachments
Tulips_result.zip
(292.65 KiB) Downloaded 11 times

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