I'm continuing to struggle with Affinity Photo's channels and alphas. I need to be able to assign an alpha to my image while retaining the underlying color data of the transparent area.   With photo it appears that the only way to get an alpha channel is to leave portions of my image transparent which results in loss of color data in the Red, Green and Blue channels. So all transparent pixels end up being black, this causes ugly halo effects on textures loaded in 3D applications.   The Compo