On 04/08/2014 10:48 AM, OonaghG wrote:
I have an RGB image (as set by Image-Mode) which is currently black & shades of
I want to alter this, in its entirety, so it is blue & shades of blue (a
specific colour of blue).

I have tried to vary Hue-Saturation and to colorify (manual says colorify should
work on RGB) but although the tools come up on screen, when I adjust the colours
in the dialog box my image does not change (I have preview turned on).

Method 1: Create a gradient from your darkest blue to your lightest blue, and use Colors/Map/Gradient map.

Method 2: Add a new layer above the grayscale one, bucket-fill it with your lightest blue, and set it to "multiply" mode.

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