ImageTransformation

ImageTransformation[image, f] gives an image where each pixel at position p corresponds to position f[p] in image.

ImageTransformation[image, f, size] gives an image of the specified size.

Examples

Fisheye effect:

img = ExampleData[{"TestImage", "Lena"}];
ImageTransformation[img, # (1 + 0.5 Norm[#]^2) &, DataRange -> Full]

Wave distortion:

ImageTransformation[img, {#[[1]], #[[2]] + 10 Sin[#[[1]]/20]} &]

Please visit the official Wolfram Language Reference for more details.