Problem with images with alpha channel appeared in two last version of xnview 1.91.2 and 1.91.3
Images are shown in preview and in viewer like there have premultiplied alpha channel - areas with black alpha become transparent and have a color of background.
I've sent you two images, one tiff file with alpha channel, and a jpg-file that is converted from tiff by xnview itself.
[1.91.2] and [1.91.3] problem with images with alpha
Moderators: helmut, XnTriq, xnview
In version 1.91.2 there have been some changes regarding the settings for transparency & alpha.