I have deleted all opaque pixels that shouldn't be there but I am still having the same issue. I don't have a draw event for my player, would a draw event be better instead of this code I have in a Step Event:Rub out the areas where the green outline appears when you play the game even though you can't see it in the sprite editor with a rubber of opacity 255. Also, can you post your draw event code.
Thanks Snail Man, turning interpolate colours off fixed my problem but the game looks lower resolution when in fullscreen. This shouldn't be much of a problem but is this meant to happen?Have you tried going into global game settings and disabling 'Interpolate colors between pixels'?
Its only there sometimesis the green outline there all the time or just some of the times?
You could try redrawing over the transparent pixels using a gray color, no opacity, and "replace" instead of "blend" color mode. Actually a better idea might be to use the color of a nearby opaque pixel, instead of using gray.
Swapping the sprite worked. The green outline only appears on my run animation for the player not any other spriteWhy dont you try swapping the player sprite with some other sprite and see if it still happens. My first step would be trying to distinguish the source, as in if its coming from the sprite, the code, or GM itself. So swap the sprite and see what happens.