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Pixel Count

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John McCready
Pixel Count
on Mar 5, 2009 at 7:03:40 pm

I am photographing given points along an artificial stream bed and want to document algae growth over time. There may be up to 7 different shades of green (algea) in a given photograph. Can Photoshop produce an accurate pixel count of each shade? I would really appreciate a step by step solution if you know of one. The magic wand tool does not appear to very reliable for this quest.



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ekim wahs
Re: Pixel Count
on Mar 5, 2009 at 8:43:22 pm

You could use select color range with Fuzziness set to zero to sample the color you want to count. The use the Histogram Panel to get a count. Mouse over the Histogram to get the count at a specific level. You may want to limit the Channel to which ever one works best ie the green channel.

Mike Shaw
Photoshop QE


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Richard Harrington
Re: Pixel Count
on Mar 6, 2009 at 1:34:29 pm

Mike.. you have too much time on your hands.... =)

See you in Boston?

Richard M. Harrington, PMP

Author: Photoshop for Video, Understanding Adobe Photoshop, Final Cut Studio On the Spot and ATS:iWork


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