Blend It

 A Starburst image (from Sketchpad):

With some Bluescale code:

Just playing with the color channels:

Below, the blend mode formulas from the Love2d documentation!

https://love2d.org/wiki/BlendMode_Formulas

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Yellow with true green, on the left; true green at 50% opacity

on the right:

A true green shader applied unto yellow:

True Green unto at 50%: