I know I read this thread a bit late but there is an easy solution for everyone.
If you use PNG don’t use built in Photoshop version. PS always fill the empty(alpha) info with white and it’s wrong method.
This is a free plugin for Photoshop:
When you install than you will found second PNG export version in the save list. (SuperPNG (upper PNG))
SuperPNG option window:
- select Clean Transparent (you need to check this at each export - some PS don’t save the setup!)
- save file
If you don’t use PNG than you need bleed out the color data (RGB) into the transparent region to avoid unwanted pixel noise at the alpha edge.
There is a free Photoshop plugin from NVidia:
When you install than you will found under Filter/xNormal
- select color info (layer)
- Use Dilatation from the xNormal option list
- Radius (in pixels) - how many pixel to bleed out into the alpha region
- save file
Welcome