Coloring individual pixels

Is there a way to change the color of individual pixels?

Say you have a black constant 256×256 and you have two lists, one with UV positions and one with RGB values so for example

UV = ([100, 100], [20, 30], [53, 35])
RGB = ([1.0, 0.0, 0.0], [0.0, 1.0, 0.0], [0.0, 0.0, 1.0])

Now loop through the UVs and RGBs list and color the pixel… I was thinking maybe the RotoPaint node can be scripted to work that way somehow? Or maybe there is an easier way to do this already?

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