This utility converts PNG file with transparency to 32bits TGA file (RGBA).
WHY IS IT USEFUL:
Unity converts all images into its own format.
There is a white border on the translucent parts when Unity imports PSD image (1_PSD screenshot).
If PNG image has transparency then Unity generates RGB components unpredictably (utility window screenshot). That image looks fine when drawing one to one (left part of 2_PNG screenshot) but has artifacts when used on 3D objects or used mipmaps (right part of 2_PNG screenshot).
TGA image has no defects (3_TGA screenshot).
USAGE:
1) Open window from Assets menu>Convert PNG to TGA...