This vfx tutorial give you an insight into image blending in GameMaker.
The image_blend is normally used for blinking or recoring an existing image/sprite. What is happening when you blend an existing image is that you take the original colors of the image (base) and blend/tint them with a second color to get a result. This works most of the time fine but it comes with some down sides. So let’s see why that it and get a crash course into color theory.
To have better results you can use a shader to color swap, here is a good video on that:
www.youtube.com/watch?v=JH5pLrXZ4w8
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CHAPTERS
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0:00 What we will discuss
0:38 Offical manual on image_blend
1:10 Color theory crash course
3:42 Why image blending/tinting is not what it seems
8:02 Where color swapping makes sense
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