0.99.6:Extract Alpha Channal wrong with a 8-bit indexed PNG

[Mapaler]

XnView: MP 0.99.6 - 64 bit
OS: Windows 10- 64bit

Neither removing the alpha channel nor extracting the alpha channel is correct with this 8-bit index png.

↓This is the source image

[xnview]

this image file doesn't contain alpha channel but a transparent index that you can change in 'edit colormap'

[Mapaler]

this image file doesn't contain alpha channel but a transparent index that you can change in 'edit colormap'

But it can extract RGB channels.
Why not convert to a 32-bit image and then extract the Alpha channel ?

And I found 'edit colormap' does not establish a record of modifications and cannot be undone after reading the index file of other images.

[xnview]

Thanks to your detailed description I can reproduce the problem.

[xnview]

This problem is supposed to be fixed in XnView MP 0.99.7. Please check and confirm the bug fix here.