# ppmcolormask(1) - man - phpman

> **TLDR:** Produce a mask of areas of a certain color in a PPM image.
>
- Produce a mask of areas of a certain color in the specified PPM image:
  `ppmcolormask {{-c|-color}} {{red,blue}} {{path/to/input.ppm}} > {{path/to/output.pbm}}`

*Source: tldr-pages*

---

[ppmcolormask(1)](https://www.chedong.com/phpMan.php/man/ppmcolormask/1/markdown)                        General Commands Manual                       [ppmcolormask(1)](https://www.chedong.com/phpMan.php/man/ppmcolormask/1/markdown)



## NAME
       ppmcolormask - produce mask of areas of a certain color in a PPM file

## SYNOPSIS
       **ppmcolormask** _color_ [_ppmfile_]

## DESCRIPTION
       Reads  a  PPM file as input.  Produces a PBM (bitmap) file as output.  The output file is the
       same dimensions as the input file and is black in all places where  the  input  file  is  the
       color _color_, and white everywhere else.

       The  output  of  **ppmcolormask** is useful as an alpha mask input to **pnmcomp**.  Note that you can
       generate such an alpha mask automatically as you convert to PNG format with [**pnmtopng**(1)](https://www.chedong.com/phpMan.php/man/pnmtopng/1/markdown).  Use
       its **-transparent** option.

       _ppmfile_ is the input file.  If you don't specify _ppmfile_, the input is from Standard Input.

       The output goes to Standard Output.

       You can specify _color_ five ways:

       o      An X11-style color name (e.g.  **black**).

       o      An  X11-style hexadecimal specifier: rgb:r/g/b, where r g and b are each 1- to 4-digit
              hexadecimal numbers.

       o      An X11-style decimal specifier: rgbi:r/g/b, where r g and b are floating point numbers
              between 0 and 1.

       o      For  backwards  compatibility,  an  old-X11-style  hexadecimal  number: #rgb, #rrggbb,
              #rrrgggbbb, or #rrrrggggbbbb.

       o      For backwards compatibility, a triplet of numbers separated by commas: r,g,b, where  r
              g  and b are floating point numbers between 0 and 1.  (This style was added before MIT
              came up with the similar rgbi style.)


## SEE ALSO
       [**pgmtoppm**(1)](https://www.chedong.com/phpMan.php/man/pgmtoppm/1/markdown), [**pnmcomp**(1)](https://www.chedong.com/phpMan.php/man/pnmcomp/1/markdown), [**pbmmask**(1)](https://www.chedong.com/phpMan.php/man/pbmmask/1/markdown), [**ppm(5)](https://www.chedong.com/phpMan.php/man/ppm/5/markdown)**


## AUTHOR
       Bryan Henderson (<bryanh@giraffe-data.com>)




                                            14 April 2000                            [ppmcolormask(1)](https://www.chedong.com/phpMan.php/man/ppmcolormask/1/markdown)