The Displace filter shifts a selection using a color value from the displacement map—0 is the maximum negative shift, 255 the maximum positive shift, and a gray value of 128 produces no displacement. If a map has one channel, the image shifts along a diagonal defined by the horizontal and vertical scale ratios. If the map has more than one channel, the first channel controls the horizontal displacement, and the second channel controls the vertical displacement.
The filter creates displacement maps using a flattened file saved in Adobe Photoshop format (except Bitmap mode images). You can also use the files in the Plug‑Ins/Displacement Maps folder in the Photoshop program folder.