histogram of image

I seek the histogram of an image: Global histogram, Individual histograms for 5 DCT modes that these functions are just: histc, hist

Answer 1

[Wayne King]

Do you have the Image Processing Toolbox?

I = imread('pout.tif');
imhist(I)

Answer 2

[Image Analyst]

You do know that they will still work don't you?

[pixelCounts grayLevels] = hist(imageArray(:));