XnView Software

It seems the bug even happens when you resize the image via resize-function, no matter which filter.
And here even disabling high quality zoom doesnt help.

Added it to the main-post.

Transparent pixels dont get filtered correctly if adjanced to none transparent pixels.

Attached I have a picture of a white circle with red background (background 100% transparent).
If you view this at 100% you correctly get a white circle.
If you view it scaled to less than 100% the circle edges ...