how do i make my picture like color gray then some part of it is rainbow?

Question: how?

Answer: Use red yellow and blue. mix blue with yellow to create green and put the green in the middle, the blue on the left, the yellow to the right, then ad red to the yellow and it makes an orange, which goes next to the yellow, in between the red and yellow. then ad a bit of blue to the red to make purple and you have a rainbow. Add red, yellow and blue together , with just a bit more blue and a lot of white and it will all turn Grey.

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