Adjusting brightness without washing out an image

I'm using a ColorTransform to adjust the brightness of an image, but it's also causing it to look faded and washed out as I increase the brightness, even by just a small amount.
Is there a way to adjust brightness without getting this effect, or something that can be done to offset it?
(edit: using Actionscript 3.0, require code solution, not something in Flash IDE)

Hi and welcome to the forums....
I'm certain you can't do that in Aperture... Aperture is a pro photo management system with some excellent image adjustment features. But for what you describe you will need Photoshop or other such application.
HTH
Gerry......

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