On this page you find a nice collection of optical illusions and effects. There are images with interesting brightness gradations and illumination effects.
There is no gradient in the gray bar in the middle
Hard to believe: The gray bar in the middle of the picture is based on a single color (no gradient)!
Ignore the text and concentrate on the different colors
Try to ignore the text and just say the color name of each word. Name the colors as fast as possible and you will see it's not that easy.
Same color on different backgrounds
The blue and orange lines have the same color values on the left and on the right side.
Dark spots appear between the black quads
Look at the picture below. Do you see dark spots between the gray quads? The picture only contains white dots between the black squares. The visual effect is widely known as Hermann-grid illusion.
The color difference between two colors is most visible on a similar background
This picture shows the Crispening effect. In all three squares both the upper and the lower blue rectangles are completely identical. The upper rectangle is a bit darker in all of them. But you can see the difference best on the right because the background has nearly the same color values.
The square A is exactly the same shade of gray as square B
The checker shadow illusion is an optical illusion published by Edward H. Adelson. The square A is exactly the same shade of gray as square B. Find more information on the Wikipedia website.
Do you like the color illusions? Do you have feedback on the pictures? Please write a comment.
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