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Swapping primary colors


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Can someone direct me how to swap the primary colors in an image? For example, I am trying to swap all of the green and blue values, or the blue for red, etc.

I have tried using the "Adjustments" - "Hue / Saturation" function, but it does not make an exact swap. What I am having to do is use the color picker for each pixel, manually swap the two color values in the Color window, and then click to update the pixel.

This is incredibly time-consuming, and error-prone. Surely someone has created a utility to automatically do this. Please help, my eyes are shot from looking at the colors so closely.

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