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`