CGImage adjusting the colors to reflect an image without a colorprofile

I have a function which returns a CGImage. The CGImage doesn't have a colorprofile, because its source doesn't use colorprofiles, however I know the equivalent profile of the source and want to add it to a CGImage. I have been able to add the color profile to the CGImage, but then when the image is displayed the colors are wrong. I understand why the colors are wrong, and I have an idea of how to fix it, but I haven't found anything to help.
Can I adjust an image (or context) to simulate the effect of 'removing' the color profile? is there a function I have overlooked somewhere?
Thanks for taking the time to look at my question and hopefully help me out.
Mahalo & Aloha
Sam Rowlands

Hi Lieven, I did exactly as you said except it would not allow me to check or uncheck the constrain proportions options. It appears to be unchecked but it does not give me an option to do anything under the Metrics tab. Do you have any idea why? Thanks.

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CGImage adjusting the colors to reflect an image without a colorprofile

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