Transparent Images and Spritesby FearlessHen
Making the background on an image or sprite transparent for use in GameMaker is very simple. First, you want to download the program "Graphic Converter" by Lemkesoft. After you download the program, open up the file you want to make transparent, and select the transparent tool from the tool bar. Select the color that you want to be made transparent (such as black or white), and that's it-- a transparent GIF for GameMaker.