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The central portions of the two crosses are the same colour. You think the one on the left is grey and the one on the right is yellow. Not true. Tear a small hole in a piece of paper to make a peephole to mask out the context. Hold it up to one image after the other, and you realise that the central portion of the right-hand image really is grey.
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Umm,care to try that again? The right hand image has a yellow center piece, measureable with a photometer.
To test it out on your computer, take the picture into a graphical editing software and use the program to copy the color. Then write down the hue saturation etc. Compare that to the color gray and the color yellow and you'll see the numbers fall inbetween.
