let's say you have an image you want to place into the video game, but it has a background that you don't want to get imported into the game. if the background is blue, can you tell the game to ignore anything blue in the image?
use the flag overlay - it makes the colour black (0,0,0) invisible (i think blue does not work) you can find this flag in the leveleditor by clicking on properties of the sprite or you can use a script by setting overlay = on;
