Hermann grid illusion / nobody knows anything

June 28, 2008

Illusion: In your peripheral vision, you may see dark spots where the lines intersect. If you look at an intersection directly, you can see that there is actually no dark spot.
The textbook explanation for this effect has to do with the ganglion cells in our eyes. In the center area of our [...]

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Surround Effects (Part 2)

June 23, 2008

One area where surround effects make a big difference is when evaluating the black level on LCD monitors. Almost all LCD monitors cannot reproduce true black and have a raised black level. In a dark room, they will have a “glow in the dark” appearance to them. The image below shows the [...]

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Surround Effects (Part 1)

June 22, 2008

One of the factors that affect the perception of an image is the content of the area surrounding it. In the example below, the center patches of the color have the same value (128 128 128 RGB) yet the left patch appears to be lighter than the one on the right.

Adding [...]

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