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Open a new picture with a black background and colors set to 16 million. Load the sky mask, available here or build one with a gradient. Shown here is [View > View through Mask]. |
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Set the forground color to the color of what will become the middle band.
Used was blue (R = 0, G = 0, B = 255). Flood fill the image with solid color, tolerance set to 200. |
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Set the forground color to the color of what will become the bottom band.
Used was pink (R = 255, G = 0, B = 255). Flood fill the image with solid color, tolerance set to 200. |
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Remove the mask [Masks > Delete] and adjust the brightness and contrast to taste [colors > adjust > brightness/contrast]. Shown here is -5% brightness and 30% contrast. |