Color changes (darkens) in screen capture - color sync gamma setting?

I encountered this weird effect that the color darkens when I did a screen capture in one Mac but not the other.
In fact, it darkens more with shift-ctrl-cmd-4 (selection capture) than with shift-ctrl-cmd-3 (whole screen capture).
The knowledge base mentioned the gamma setting in http://support.apple.com/kb/ht3712 but the color darkens in the clipboard, so there is no way to change the color sync if it is not a file. I tried to re-calibrate my display using different gamma setting, but it didn't change any color.
In my other Mac, I can do a screen capture and the color is preserved as is. It is only in one Mac that did this. The color darkens so much that it practically becomes black-and-white.
Any suggestion would help. I think it has something to do with the color sync profile setting.

I found out that the darkening of the color in screen capture is caused by screenshot captured into jpeg. The darkening happens when the lines are thin, due to the averaging effect of jpeg. If the lines are thick, then the change in color is not apparent.
Now, the problem is, I can't change screen capture to capture in png. I used Tinker Tool, and deleted com.apple.screencapture.plist , nothing would change it back to capture in png.

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http://www.bearbyte.blogspot.com/

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> Maybe I should explain that when I do the screen
captures at first, my
> monitor
> is set at 1600X1200.
> Should I set it at 800X600 when doing the captures
first?
A screen capture captures whatever number of pixels you are
grabbing. If
your monitor is 1600x1200 and you capture the entire screen,
then the
resolution you have captures is 1600x1200.
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image than
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> 1. Should I do the captures with the monitor set at
800X600 if the Flash
> stage
> is 800X600? If so, why?
That would make sense. Why? You can only show 800x600 pixels
in your final
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> 2. If the projector resolution is 800X600, can I set my
Flash stage at a
> higher size [resolution], say 1024X768? Will that
actually affect the
> resolution when the Flash movie is projected on a
projector with an
> 800X600
> resolution if the Flash movie stage is larger?
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flash file, you should be able to see all of the pixels at
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> 3. What affects the final resolution output of the BMP
images [jpeg's] in
> Flash for a presentation like I am doing?
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> 4. What size should I capture the images at so I don't
have to resize them
> in
> Flash?
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> WHAH! I just want this presentation to be successful.
It's a training
> session
> on educating folks on computer virus
prevention/protection from and ID
> theft,
> something this world is in dire need of!
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Color changes (darkens) in screen capture - color sync gamma setting?

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