vizsum

A generative image exercise for converting checksum data into something visual. ImageMagick's sparse-color interpolation methods are used to create stunning unique images.

Example

vizsum README.png < README.md

How this works

Take the following message digest

echo -n emcconville | md5
#=> 8a59b44064a204d569feec76645a6dcb

This project proposes that the data generated by a digest can map to a Pixel data structure.

,---- X coordinate
||,-- Y coordinate
||||
8a59b44064a204d569feec76645a6dcb
    |     |
    `-----+- color value

Or even a Hue only degree value.

,---- X coordinate
||,-- Y coordinate
||||
8a59b44064a204d569feec76645a6dcb
    ||
    `-- hue angle

So any digest blob can (unsafely) be cast to a C data structure

struct pixel {
    struct coord {
        unsigned char x,y
    },
    struct color {
        unsigned char r,g,b
    } // or hue 
}

Scaling bytes against quantum colors results in some truly unique points of color. See below for examples of diffrent ImageMagick Interpolation of each color.

Barycentric Interpolate (default)

echo -n emcconville | vizsum -barycentric sumimg.png

Digest	Flag	Hue only
Adler32	-barycentric -adler32	-barycentric -adler32 -hue
	same as -hue
GOST	-barycentric -gost	-barycentric -gost -hue
MD5	-barycentric -md5	-barycentric -md5 -hue
SHA1	-barycentric -sha1	-barycentric -sha1 -hue
WHIRLPOOL	-barycentric -whirlpool	-barycentric -whirlpool -hue

Bilinear Interpolate

echo -n emcconville | vizsum -bilinear sumimg.png

Digest	Flag	Hue only
Adler32	-bilinear -adler32	-bilinear -adler32 -hue
	same as -hue
GOST	-bilinear -gost	-bilinear -gost -hue
MD5	-bilinear -md5	-bilinear -md5 -hue
SHA1	-bilinear -sha1	-bilinear -sha1 -hue
WHIRLPOOL	-bilinear -whirlpool	-bilinear -whirlpool -hue

Inverse Interpolate

echo -n emcconville | vizsum -inverse sumimg.png

Digest	Flag	Hue only
Adler32	-inverse -adler32	-inverse -adler32 -hue
	same as -hue
GOST	-inverse -gost	-inverse -gost -hue
MD5	-inverse -md5	-inverse -md5 -hue
SHA1	-inverse -sha1	-inverse -sha1 -hue
WHIRLPOOL	-inverse -whirlpool	-inverse -whirlpool -hue

Shepards Interpolate

echo -n emcconville | vizsum -shepards sumimg.png

Digest	Flag	Hue only
Adler32	-shepards -adler32	-shepards -adler32 -hue
	same as -hue
GOST	-shepards -gost	-shepards -gost -hue
MD5	-shepards -md5	-shepards -md5 -hue
SHA1	-shepards -sha1	-shepards -sha1 -hue
WHIRLPOOL	-shepards -whirlpool	-shepards -whirlpool -hue

Voronoi Interpolate

echo -n emcconville | vizsum -voronoi sumimg.png

Digest	Flag	Hue only
Adler32	-voronoi -adler32	-voronoi -adler32 -hue
	same as -hue
GOST	-voronoi -gost	-voronoi -gost -hue
MD5	-voronoi -md5	-voronoi -md5 -hue
SHA1	-voronoi -sha1	-voronoi -sha1 -hue
WHIRLPOOL	-voronoi -whirlpool	-voronoi -whirlpool -hue

fin

Suggestions, comments, and requests are welcome.