What is meant by probability distribution function of an image

How to find the probability distribution of an image

Answer 1

[Image Analyst]

Try this:

[pixelCount grayLevels] = imhist(grayImage);

special considerations must be taken for floating point images.

[Kanak Jain]

what if the image is coloured?

[Image Analyst]

What do you want to know about it? The histograms for each color channel independently? If so, see my attached demo.

[Kanak Jain]

How can we define the probability distribution of a colored image?

[Image Analyst]

I'll have to repeat my last comment.

The histograms of each channel separately will give you detailed information. Hopefully it's what you want, but I don't know because you're not answering my question but instead asking another question.