X and Z replace each pixel by the rhomboid (respectively the rectangle) which contain it. Then we have an enlarging of the non-white zones.
x and z (lowercase) do the same, except pour the original pixel, which becomes white. Then we have someting like contours, or multiple parallel lines.
XXX and ZZZ do the operation thrice.
The same functions, with a 2 added at end (for instance x2, Z2...) give similar results, but with expansion of the whites againts the colors.
flip and flip_H flip horizontally
flip_v flips vertically
flip_d flips diagonally (horizontally and vertically)
More elaborate symmetries (get a list typing sym.c) are available in three seriees, each one with vertical, horizontal and diagonal variants :
sym_h , sym_v et sym_d operate arount the center of the image
symG_h, symG_v, et symG_d operate around the Golden section
symR_h, , symR_v et symR_d operate around lines chosen at random
These symmetries mix the original image with its symmetric image, merging in additive or subtractive mode according to the image density.
Roxame has a set of elementary "morphogeometric" functions, i.e. applying a given patten to each pixels. The results can be quite surprising and disappointing, but sometimes great.
Generally, nothing interesting (if something at all) will be obtain from a reaist picture. Bigin by a reduction to contours or to a (binarily) white-black document (BW function). Some interesting results can also be obtained with quadri.pl.
Roxame's basic functions of this king work on a white background
The code : Geom,