As on elements 10 how to measure an area (in pixels or %) of certain color in a picture?

I need to separate the ratio of different colors in a thermal image; how many pixels ( or %) of certain red, yellow, white etc.
Is this possible in Elements 10?

You would make a selection of the particular color, read the pixels from the histogram and divide by the total number of pixels to get the percent.
However in reality that's harder than it sounds.
One way might be to use an hue/saturation adjustment layer to help isolate a particular color and then make a selection.
Something like this:
original
1. add a hue/saturation adjustment layer
2. select the color from the dropdown menu. For example yellows.
3. move the saturation slider to zero
4. move the lightness slider all the way left (turns the yellows black) or all the way to the right if you have any black areas in the original image (turns the yellow white)
5. use the magic wand tool to select the black
6. read the number of pixels in the selection from the histogram

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I am measuring the torque exerted by a large motor on a shaft using a load cell and lever arm. The shaft runs at approx 150 rpm. I have attached a drawing that shows the output I get. This is a test rig.
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Attachments:
drawing of torque signal.gif ‏26 KB

Thanks for the reply. I understand what you are saying. However, I might have to modify my method for measuring the peaks if I choose to implement your idea. I have taken a screenshot of my "peak finder" code and attached it.
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peak_find_screenshot.jpg ‏45 KB

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psram wrote:
Hi Experts,
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http://jonathanlewis.wordpress.com/2007/04/26/heisenberg/
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sbmgrams wrote:
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forbemag
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As on elements 10 how to measure an area (in pixels or %) of certain color in a picture?

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