For example, in my little space game I want to use nebulas, star fields and space dust but I want some of them to be more visible and some of them to be less visible some places just to make it varied. To do this, at the moment I have to use multiple version of the same images with different transparency which makes the size of the game bigger, and also not very convenient to edit all the images multiple times. If I could set transparency inside GD, I could use one single image and make the game size lower this way and also would be more convenient.
Of course we can set opacity using events but it also not that convenient as all the nebulas, space dust..etc are part of the same object as animation and I simply set the animation number in properties to choose which nebula I want to use, or which space dust I want to use inside the scene. To change opacity using event I should also check actual animation of object and also position as I don't want to use the same opacity for every single one. I want it to be varied.
All I ask is an option in sprite object properties to set transparency/opacity of object inside the scene using values such as 0-10 or 0-100 or something, a slider maybe, similar to size, rotation, Z order, animation.