|-b(0-255)||Use the given background brightness. 0 means black, 255 means white. You can try other values, but the resultant image will be quite ugly. The default is 0 (black).|
|-c||Use the alternate coloring method. Flips RGB to BGR.|
|-a||Create the fractal with 4 different color areas.|
|-g||Create a semi-grayscale image. The output varies heavily depending on the -b switch.|
|-i(1-lots)||Use the given intensity of color. With a black background, a higher intensity produces a brighter image. With a white background, higher intensity produces a darker image. In all cases, calculation time doubles every time you double the intensity. The default is 30.|
|-l(32-128)||Use the given checksum length. Modify this number to match the hash function you are using. Examples: 32 for md5, 40 for sha1, 64 for sha256, 128 for sha512... The output of 128 is foggy (but still useful). Higher values will result in crappy images, therefore 128 is the maximum accepted. The default value is 32.|
|-r(1-1000)||Use the given value for both the x and y resolutions. The calculation time will quadruple every time you double this value. The default is 300.|
|-t||Create the image with a transparent background.|
|-v||Output version information and exit.|
|-?, -h, --help|
Output help information and exit.
To create a nice 500x500 fingerprint of your kernel type:
md5sum /boot/mykernel | visprint -r500 > mykernel.png
Lets say that you want a 100x100 sha1 fingerprint of your websites index file, with png transparency that looks good on a white background:
sha1sum index.html | visprint -l -r100 -b255 -t > index.png
Goizeder Ruiz de Gopegui http://www.tastyrabbit.net/visprint
Ian Golderg: http://http.cs.berkeley.edu/~iang/
Raph Leviev: http://www.cs.berkeley.edu/~raph/
Hal Finney: http://www.rain.org/~hal/
David Johnston: http://www.cybercities.com/ston/
Soren Andersen: http://intrepid.perlmonk.org/
The original code was written by Ian Goldberg, based on an idea by Hal Finney, in a post to the coderpunks mailing list. The most excellent color enhancements were added by Raph Levien. David Johnston made a port for Win95 console mode and added a bunch of nice features. Soren Andersen developed the png and transparency code. Goizeder Ruiz de Gopegui, the current maintainer, cleaned the code, created the documentation and put everything together.
Copyright 2007 Goizeder Ruiz de Gopegui
This is free software. You may redistribute copies of it under the terms of the GNU General Public License.
There is NO WARRANTY, to the extent permitted by law.
|Goizeder Ruiz de Gopegui||VISPRINT (1)||2.0|