Background for viewing 20" iMac gradient

Experimented with a number of background colors to accentuate the gradient problem. Found a salmon color worked best. Easily shows the top to bottom gradient, but even found another gradient working left to right.

Experimented with a number of background colors to accentuate the gradient problem. ...
Solid backgrounds are one approach, but here's a test that demonstrates gradient problems (or not) with more realistic™ display contents:
*1) Download a smallish, colorful test image and drop it on your desktop. For example:*
http://a.img-dpreview.com/reviews/CanonS5is/Samples/Comparedto/canons5ISISO80v2-001.jpg
*2) Control-click on the desktop and select: "Change Desktop Background..."*
*3) Click on "Choose Folder" and navigate to the test image on your desktop.*
*4) Set the background mode combo-box to "Tile" (if it's not that way already).*
*5) Compare the image at various regions of the screen. If you used the test image above, pay particular attention to reflections on the Bailey's bottle, the width of the gray-scale's transition region, and overall color saturation.*
My 20" failed this test dismally -- and the test pattern helped convince several geniuses at the local Apple Store that my 20" display had a serious problem.
BTW, I carefully avoided any discussion of the 20" display's off-axis performance. IMO, 'viewing angle' is a minor issue -- and raising it would only confuse/dilute legitimate complaints about seriously "washed out" colors near the bottom of (some?) 20" displays.
So, I traded-in the 20" and replaced it with the 24" -- and the jury's still out on that one. My new 24" also has a noticable left-to-right brightness gradient (very evident with solid-color backgrounds); however, it doesn't show a trace of the "washed-out colors" problem that was conspicuous on my 20" unit.
For reasons I can't explain, images in all areas of the display appear to retain excellent detail, contrast, and color saturation -- they differ only in absolute light intensity. The 24" display passed my "tiled images" test with flying colors. To my (non-professional) eye, there were no discernable differences in image quality anywhere in the screen. Maybe the 24" panel has wider dynamic range or somesuch -- but that's gettin' deep into subjects that I don't pretend to understand.
In any case, the 24" display is vastly better than my 20" -- and possibly tolerable. The trade-in transaction appears to have re-started the clock on returns, so I have a while to 'test-drive' it.
Looby
*"If it's not one thing, it's another!"*
\- Roseanne Roseannadanna

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