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The practice of ‘displacement’ is using the pixels of one image to move the pixels of another image. The image that's used to displace another image is called a 'displacement map' ('dismap' for short). Let’s say you apply Image 1 as a dismap to Image 2, and set the displacement to 5.
Here’s what happens:
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Anywhere Image 2 is white, Image 1 pixels get pushed one way by 5 pixels. |
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Anywhere Image 2 is black, Image 1 gets pushed 5 pixels in the other direction. |
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Shades of gray push the pixels somewhere between -5 and 5 pixels. |
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Neutral gray does nothing at all, as it is right in the middle, and gets the value of 0. |
An example of displacement:
The left side of this image is normal. The right side has a dismap applied to it. Notice that on the right side, white pushes the pixels toward the right, and black towards the left. |
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Many filters use displacement in obvious or subtle ways. You can read more about displacement on our Graymap page and in the Anarchy Toolbox manual. |
