Is there a way to export polypaint texture with alpha channel?
The Transparent slider in Tool>Texture Map is able to make the black colored areas transparent but the exported PNG / PSD / TIF texture does not reflect this transparency. The exported image is a solid image with the polypaint and black merged as one layer.
thanks in advance
The transparency using pure black is only a ZBrush display effect. There’s no way to automatically create an alpha from that. You’d have to edit the file in Photoshop or another image editor.
ah that sucks. hope next ZB will have this feature 
thanks Marcus!