The main problem with the rainbow is the sharp division between the red and yellow. In the Hue/ Saturation dialog box, select yellows from the edit drop-down and change the Hue setting as shown. Then select the greens and make the change as in the example. The result is a much more lifelike rainbow.
Finally, the idea is to create an underwater source for the root of the rainbow. This is going to be a nebulous area where the rainbow’s base colours lie just below the surface. On a new layer, create a high-value feathered selection describing the underwater colours’ overall shape. Drag the Gradient called Spectrum through the selection from the centre to the outside using the Conical option.
Deselect the selection and change the layer blend mode to Hue and the Opacity to 90 per cent for the final result.
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