Provided by: printbill_4.1.2-1.1_i386 bug

NAME

       percentblack  -  how  much coverage is there in a given 8-bit grayscale
       PNG image.

SYNOPSIS

       percentblack filename.png

DESCRIPTION

       percentblack prints a percentage coverage for a  given  PNG  image,  to
       three decimal places.  filename.png must be 8-bit grayscale, such as is
       generated by GhostScript’s pnggray device. Pixels which are  gray  make
       an appropriately scaled contribution to the total percentage.

EXAMPLE

       percentblack filename.png

       yields

            4.462

       indicating that 4.462% of the page is covered in black.

REQUIREMENTS

       percentblack only requires libpng to be present on the system.

INSTALLATION

       Please  see  the accompanying README and INSTALL files for installation
       instructions.  Chances  are  if  you’re  reading  this  it’s  correctly
       installed.

AUTHORS

       printbill  and  the  accompanying  utilities  were  written  by  Daniel
       Franklin (d.franklin@ieee.org). The web interface was written  by  Phil
       Ciufo (phil@snrc.uow.edu.au).

AVAILABILITY

       You   can   always   grab   the   latest   and  greatest  version  from
       http://ieee.uow.edu.au/~daniel/software/printbill

SEE ALSO

       printbill(1),  printbill(8),   printbilld(1),   printbill_configure(8),
       printbill_grapher(1),   percentcolour(1),  percent_cmy(1),  pqcheck(1),
       printquote(1),   printbill_printer(1),   printbillrc(5),   printcap(5),
       init_from_passwd(8), pqm(8).