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Hey, Marvin, geez, give me a chance to finish my post! I had to start the charcoal for the barbecue and you snuck in there and nailed me! Anyway here's the rest of it. Don't let me catch you taking a peek though!
This is another demo to illustrate some of the points in the post above.
The field is divided into three squares of different intensity, on each of which is superimposed a smaller square that differs from it in absolute intensity by 8%. Thus the contrast ratios in the three sections are the same. I cannot visually detect the small square in the leftmost section, but those of you with Photoshop or paint programs can grab the image and confirm that it is there by using your eyedropper tool. The background intensity in the rightmost section is the highest intensity available on my CRT.
A photometer would have no trouble detecting the smaller squares and would yield the same contrast ratios for all three sections. Obviously the eye sees it very differently. For the explanation of this I refer you to the earlier posts on this thread.
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