NAME

       pamgetcolor - display the average colors from specified regions in an image.

SYNOPSIS

       pamgetcolor [-format format] [-radius radius] [-linear] [-infile pamfile] region1 [region2
       ...]

DESCRIPTION

       This program is part of Netpbm(1).

       pamgetcolor prints the average colors of a set of circular regions in the input image.

       You specify a region as a positional argument of the form column,row[:label], where column
       and  row  are  the  coordinates of the center of the circle (first row of pixels is row 0;
       leftmost column of pixels is column 0), and label an optional label that pamgetcolor shall
       display to identify that region in its output.  All regions have he same radius, specified
       by the -radius option.  The region centers must lie within the image, but part of a region
       may  fall  outside the image; pamgetcolor considers only the part that is within the image
       in calculations.

EXAMPLES

       To read the color of the pixel at location (10,14) in the default format:

           pamgetcolor 10,14 -infile test.ppm

       To read the colors of three pixels in the default format, assigning a label to each pixel:

           pamgetcolor 10,10:topleft 100,100:middle 200,200:bottomright -infile test.ppm

       To read with 16-bit precision the average color in the circle with a radius of four pixels
       and the center at (100,100):

           pamgetcolor -format int:65535 -radius 4 100,100 -infile test.ppm

OPTIONS

       In addition to the options common to all programs based on libnetpbm (most notably -quiet,
       see
        Common Options ⟨index.html#commonoptions⟩ ), pamgetcolor recognizes the following command
       line options:

       -format
              This  specifies  the  format in which to output the colors.  The output is always a
              Netpbm color specification ⟨libppm.html#colorname⟩ ; this format tells which of the
              various specifications for the same color the program uses.

              This  argument is of the form formatId[:param], where formatId specifies the format
              and param is a positive integer parameter that, depending  on  formatId,  indicates
              either precision or normalization. The following values are possible for formatId:

       int    Samples are decimal integers normalized to the maxval specified by param.  Example:
              rgb-255:255/128/64 This format is the default, with a maxval of 255.

       norm   Samples are floating point numbers normalized  to  unity.   E.g.   rgbi:1.0/0.5/.25
              param specifies precision as the number of digits in the fractional part.

       x11    Samples are hexadecimal numbers with param digits, e.g. rgb:01/ff/8000

       -radius
              sets  the  radius  of the regions.  A value of zero causes pamgetcolor to measure a
              single pixel and is the default.

       -infile
              This specifies the Netpbm file to analyze.

              If you don't specify this option, pamgetcolor reads the image from Standard Input.

       -linear
              This tells pamgetcolor to work with the intensity-linear variation of Netpbm images
              where the samples are proportional to light intensity rather than to brightness, as
              in true (gamma-adjusted) Netpbm formats.

SEE ALSO

       pnmcolormap(1),

AUTHOR

       This program was first submitted by Anton Shepelev (anton.txt@gmail.com).

HISTORY

       This program was new in Netpbm 10.83 (June 2018).

Table Of Contents

       •

              SYNOPSIS ⟨#synopsis⟩

       •

              DESCRIPTION ⟨#description⟩

       •

              EXAMPLES ⟨#examples⟩

       •

              OPTIONS ⟨#options⟩

       •

              SEE ALSO ⟨#seealso⟩

       •

              AUTHOR ⟨#author⟩

       •

              HISTORY ⟨#history⟩

DOCUMENT SOURCE

       This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The  master
       documentation is at

              http://netpbm.sourceforge.net/doc/pamgetcolor.html