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How does the imhist function work for RGB image?

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John Doe
John Doe on 30 May 2020
Edited: John Doe on 30 May 2020
Hello everyone.
I looked up the use of imhist function. It plots the histogram for a grayscale image. But if the input is an RGB image, it still produces a histogram? Is it converting the RGB to grayscale and then showing the histogram?
And would it be technically correct to show the histogram for a RGB image this way? Thanks in advance!


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Accepted Answer

Image Analyst
Image Analyst on 30 May 2020
Edited: Image Analyst on 30 May 2020
Did you try to look at the source code
>> edit imhist.m
Also, see attached demo. You might like it.


John Doe
John Doe on 30 May 2020
Thanks for the prompt answer, Image analyst.
So, should I go for color histograms in case of RGB image or should I use the default imhist function? imhist shows a colorbar in graytone for RGB image. I just want to be technically correct here.
John Doe
John Doe on 30 May 2020
I checked the source code. I think it's performing operation determining the class (uint8/logical) etc.

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