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Colour Exchange?

Mar 9, 2012, 23:47
Post: #1
Colour Exchange?
Hi!

I am trying to exchange two colours. However when I used 'Colours -> Map -> Colour Exchange' and specify the 'from' and 'to' colours appropriately... the original colour does not change. e.g. I have a blue solid circle. I want to make it green (it is anti-aliased so can't use fill). The 'from' colour is set to blue (using the colour picker) and I specify a colour green. However the circle remains the original blue.

I have definitely selected the correct layer, however maybe this is the wrong tool to use? I have already looked a tutorials and the help and it doesn't seem to work for me. I'm using GIMP 2.6.11.

Any ideas how to achieve this? Thanks! Smile

p.s. If you're American then ignore the 'u' in Colour Wink
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Mar 10, 2012, 01:02
Post: #2
RE: Colour Exchange?
Thanks ofnuts.

I couldn't get Rotate Colo(u)rs to work for what I require.

Let me explain in greater detail what I'm trying to do:
The main colour of the circle is #3db8b8 (with anti-aliased variations of this colour on the circle's edge obviously). I want to change the main colour of the circle to #008000, and still change the anti-aliasing correctly for that colour so it looks correct.

So far, Colour Exchange, Colour Rotate or Colours Hue-Saturation all fail to deliver this goal as far as I can see. Is there a way to get the specific colours I want?

Thanks in advance.
p.s. I love your spelling-agnosticism Smile
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Mar 10, 2012, 01:59
Post: #3
RE: Colour Exchange?
I worked it out. I used 'Colour Exchange' but had to set the Red, Green and Blue thresholds all to 1.000. The default setting of 0.000 failed to do anything useful.

The anti-aliased pixels also correctly change colours as required.

However thanks for introducing me to the Colour Rotate method, that looks good for photographs rather than for things like logos.
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