Can't use Color to alpha on that one

[Ofnuts]

(05-18-2024, 07:10 AM)PixLab Wrote: Very vicious selection...

Select to path doesn't work, no path created,
Zoom in selection marching ants don't show up
Select to Channel and drop that channel on the canvas shows 1 pixel not fully white, and 4 pixels (NSEW) not fully black...

So it's king of "half" selected pixels certainly due to semi-transparency.... but why the marching ants of the selection don't shows up... a "half" pixel is too little?

The ants show the boundary between pixels that are > 50% selected and those that are <=50% selected. In other words they walk the 50% contour line. So if you have only "weak" partial selections, there are no ants.