XnView Software

XnViewMP 1.8.0 64bit
Windows11 (23H2), display resolution 3840x2160, win scaling 150%

Viewer / Batch convert - change color depth

To reproduce:
0. clean portable version
1. open test image (8bpp, palleted, yellow color is transparent) in Viewer 2. goto Change color depth
- select 24bit, any color (eg black)
- press OK
image will be converted to 32bit (transparency preserved)

expected result
image to be converted to 24bit, if index color is transparent - use color from "Change color depth"
if user wants to preserve transparency - 32bit has to be selected manually




Related

• issues
  - done -
  1.8.0 - viewer - change color depth - 32bit result when converting 8 to 24 (1.8.1) current post
  1.6.5 - view - transparent index visible when zooming (1.8.1)
  1.7.2 - viewer - Show alpha became disabled (1.8.0)
  1.4.0 - viewer / batch convert - Change color depth to 8bit + Filter = mess (feature)

• suggestions
  App UI - menu structure - View - improve channel commands

Thanks to your detailed description I can reproduce the problem.

This problem is supposed to be fixed in XnView MP 1.8.1. Please check and confirm the bug fix here.

fixed in 181