How does the imhist function work for RGB image?

2020 5 30
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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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Image Analyst
Image Analyst 2020-5-30
编辑：Image Analyst 2020-5-30

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Did you try to look at the source code
>> edit imhist.m
Also, see attached demo. You might like it.

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John Doe
John Doe 2020-5-30
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 2020-5-30
编辑：John Doe 2020-5-30
I checked the source code. I think it's performing operation determining the class (uint8/logical) etc.

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