Graphics

Miscellaneous graphics source and apps.

See also related sections : Image Coding , and Genesis3D Stuff amd Binaries .

June, 1998

SortPal (12k, Zip) , a palette-sorter. We read in a BMP, sort the palette, and spit it out. The sort is done to minimize the "weighted" "perceptual" average error between adjacent palette entries. By weighted I mean, averaged with respect to the actual pixels in the image (multiply each distance by the usage of that palette entry), and by "perceptual" I mean that it is an MSE error in the LAB color space. This is a generalized Travelling Salesman Problem, and we do a pretty darned good job here.
Now offers : greedy, lazy, and genetic sorts. Also offers an 'optimize' sort.
PalBMP (15k, Zip) a palettizer. The source contains many different types of color quantizers; we use an improved octree-pruning method for speed, followed by a local-K-means pass to speed up the sort.

These may require GLUT

GLpal (33k, Zip) (with Win32 Exe) an OpenGL program which plots the palette of a BMP as points in space, with their colors; mostly intended for looking at post-'sortpal' data (so you can get whacked off my mad sorting skills).
GLterrain (35k, Zip) (with Win32 Exe) ; plots a grayscale heightmap raw image as a terrain. Not very slick, but a simple OpenGL demo.

This stuff is hugely amusing to me. Plot animeq -t5 ((256*sin(x/t))~(256*sin(y/t))) as a hue. See some examples in the gallery.

AnimEq (50k, Zip, exe & src) This is hours of fun, and a great strain on your CPU :^) The slider dialog is kind of glitchy. You have to press play, then slide the frame number up to 2; it should kick from there.
ColorEq (45k, Zip, exe & src) ; simpler version. Just use "coloreq " on the command line.

Charles Bloom / cb at my domain

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