Because the makers of Game Maker were lazy, they didn't code alpha channels into the game editor. This means by default any images you use with alpha channels (opacity etc) will just show as normal images.
You can fix this by adding a controller object with (or adding into your controller object) the following event:
Event: CREATE
Execute code
Make sure all images are kept in your game folder, and that if they are in subdirectories you include that in the file path.
Simples!
You can fix this by adding a controller object with (or adding into your controller object) the following event:
Event: CREATE
Execute code
sprite_replace_alpha(sprite_name,'original_image.png',1,true,true,0,0);
Make sure all images are kept in your game folder, and that if they are in subdirectories you include that in the file path.
Simples!