Grayscale Image Intensity Threshold

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Thomas
Thomas 2013-11-24
回答： Image Analyst 2013-11-24
I have a greyscale image where each pixel is given an intensity value with 0 being black and 1000 being white. (not actual values just given as an example. I want to set a threshold for intensioty values so that pixels above this threshold are turned red.
How do i do this?
I thought if i did a hist(intensity values, 1000) then i could simply set the threshold by the bins i wanted included. For example i could say only values that are in the last 200 bins are the ones i want turned to red. Is it possible to specify Matlab to manipulate individual bins?

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回答（1 个）

Image Analyst
Image Analyst 2013-11-24
You don't need to take the histogram. Simply threshold and set up the red, green, and blue color channels in a color image. See attached demo below in blue.

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