Image changes when straightening

I've got some quite noticable brightness/colour changes on some of my images when using the straighten tool. With small waves on water, in particular, I can see the waves getting noticeably darker.
Anyone else seen this? (I'm not applying any other adjustments).
I know there'll always be some artifacts when doing this kind of inter-pixel interpolation, but it seems to me to be consistently in error, and in the same direction, in this case.
Quentin
P.S. I found these hints about gearing down the straightening rather handy:
http://discussions.apple.com/thread.jspa?threadID=613193&tstart=15

Well, I haven't tried prints, but I've just tried exporting a 'before' and 'after' TIFF, and they both look OK.
So, yes, I think it's a limitation of the way Aperture displays the rotated image.
Note to self: don't straighten unless needed, and do any image adjustments with straightening switched off.

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This doc is unnecessarily complex in its color structure.
It uses CMYK and seven spot colors. CMYK is DeviceCMYK,
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CanonMan49 a écrit:
Thanks for your reply Michel ...
The colour setting in both Editor and Organiser is: 'Always Optimise Colours for Computer Screens'
I believe this option will select the sRGB colour space by default and that the option 'Always Optimise for Printing' will default the colour space setting to Adobe RGB. Is this so? I only print occasionally (most of my viewing is on the monitor or the TV) but it would be nice to know if the chosen colour space chosen produce this odd effect I'm experiencing (although I sincerely doubt that it's got anything to do with it).
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Such a difference is often noted when a file with aRGB colour space is seen in a software that believes it's sRGB. Nothing in your worklows seems to explain that.
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Image changes when straightening

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