Originally posted by hammerhead
but how do you make transparencies on a skin (leaving the part that you want not to be transparent not transparent)???
The method is different for different art programs, but the basic concept is to start with a window with no painted pixels in it, then save as a 24 or 32 bit png.
In Photoshop 7 that would be:
Select New... from the File menu.
Under the Contents section, select Transparent, then click OK.
After you have your image made, select Save As... from the file menu.
For format, select PNG, then click Save.