to take histogram of image pixels

sir, i have to Take a histogram of image pixels. I use nBins=100 equally spaced between [0,1]. can u tell the code for this

Answer 1

[Image Analyst]

[pixelCounts, grayLevels] = imhist(grayImage, nBins);

[POOJA KJ]

where should i specify the spacing of 100 bins from 0 to 1

[Image Analyst]

It's done automatically if grayImage is a double image, not uint8.

If you don't trust it, you can use histc()

edges = linspace(0,1,100);
counts = histc(grayImage, edges);