I found the easies way to do this is create your image in Photoshop (or Gimp which is free) save it as png (NOT INTERLACED). Dont' forget to use the Save for Web & Devices option to set it as png24. Then using infranview (which is free!!) you can save as to a png again (using a diff name) and during the save it will ask you to select the transparent color, click on the color you want to be transparent and it will save it to correct png for use as a boot image in QF. As friedmann said: You could do 1 px this way, such as color it Magenta (normal color for transparecy anyway) and when you save select that 1 px as the transparent. I tried this with a full image as well, and it worked 100% no prob.