On Wed, Feb 21, 2007 at 07:27:20PM -0800, Wade Pinkston wrote:
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> 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.
If the image is in an indexed format, you can use identify from the
imagemagick suite:
$ identify -verbose some.gif
[...]
155: (238,238,238, 0) #EEEEEE00
244: (245,245,242, 0) #F5F5F200
264: (249,249,249, 0) #F9F9F900
139: (252,252,252, 0) grey99
3885: (255,255,255, 0) white
3197: (235,235,217,255) #EBEBD9FF
[...]
This shows that this image has 3,885 white pixels.
-troy
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