XnConvert 1.77 - Change color depth bug?

[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...

[xnview]

what's the problem?

[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

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

Am I missing something?

Tulips.zip

[xnview]

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

[cday]

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?