Photoshop CS rounding/gamut errors?

[VegasRyan]

Please view the included image.

http://www.polycount.com/cottages/mysterymachine/flower-cs-error.jpg

I am seeing some strange artifacting in PS CS when I adjust the levels on my images. Especially high-key areas where the pixels go all the way to white. I've never seen this with PS 7.01, nor can I find any mention of it anywhere online.
Ive disabled the "out of gamut" warning, thinking that was the problem, however the blue/cyan pixels persist.

Any solutions?

Thanks!

[bigcloud]

Someone please correct me if I'm wrong, but I think that "out of gamut" refers to when you're working for PRINT and in CMYK mode. Do you get the same problem when working in both CMYK and RGB modes?

[sPECtre]

Does the button located under the OK one read "reset"?

I say this because usually, in levels, if one pushes on the ALT key, there is a gamma warning, and also the "cancel" button becomes the "reset" one...

You may have the ALT key down, of a problem with your modifier keys (usually, some third-party program causes trouble)

[Greg Vander Houwen]

This artifact would'nt persist in the image if it were an out of gamut warning, unless the image above is a screen capture.

Any luck with this VegasRyan?

Greg

[VegasRyan]

Sofar no luck in correcting this strange behavior.
On Monday I plan to contact Adobe,to see if they have any record of this problem,and a solution to it.

the problem not only persists on screen, but is IN the values of the pixels, not just display phenomena.They read as greenish/cyan in the color picker. The file will save with these errant pixels.

[Greg Vander Houwen]

They are likely to tell you to toss/create a new prefs file. That would be my next try.

Greg

[Phil_The_Rodent]

The Red channel is obviously going funky. If the math is hitting null rather than peaking at 255, you'll get zero return. Resetting prefs is probably best. Hold down Ctrl-Shift-Alt on startup.

To save what you can of these images, go to your green channel, copy it to a new layer, and set the blending mode to luminocity. Hold alt and add a layer mask, and airbrush white with a soft edge and a low setting over the cyan spots until they disappear.

[Greg Vander Houwen]

Thanks Phil.

Greg