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Painting an image

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Hello, I have generated 2D noise. And I need to paint this: Darker places I want to be painted in red and lighter places I want to be painted in yellow. And I want them to blend smoothly. How can this be done? Thank you in advance, Ilya.

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You could use the noise as an alpha map for green, with red underneath it. That way you will always have the red channel = 255, and the green channel will be somewhere between 0 and 255 (red=255 green=255 makes yellow).

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