På 2007-02-21, skrev Wade Pinkston: > Hello, I need to process some images and count the number of pixes of a > given color. > > A little background. I want to take pix of leaves against a mat > background. The leaves are then subjected to damage. I'll then take a > duplicate photo. Now what I want to do is subtract out the colors of the > leaf leaving only a two tone image. > > I was hoping to find a way to then use ImageMagick or Gimp to count the > pixels of color so I can then get a percent change between the two images. > > Does anybody know how to get ether of these two programs to give this type > of information. Actually any software would be help full.
I don't know how to do this with Gimp or ImageMagick, but what about
using ppmhist from the pnmtools? To quite the manual:
NAME
ppmhist - print a histogram of a portable pixmap
SYNOPSIS
ppmhist [-hexcolor] [-noheader] [-map] [-nomap] [-sort={frequency,rgb}]
[ppmfile]
DESCRIPTION
Reads a PPM image as input. Generates a histogram of the
colors in the image, i.e. a list of all the colors and how many
pixels of each color are in the image.
That seems like what you asked for.
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