How to reduce grayscale levels ?

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Mohab Mostafa
Mohab Mostafa 2015-4-27
评论： Image Analyst 2018-1-4
I have an RGB image, converted it into Grayscale image X = imread('lena.bmp'); Y = rgb2gray(X); now the image is represented by 8 bits (256 levels) and i want to quantize this image "Y" by reducing the grayscale levels to 32 (5 bits), how to do that ?
i know i can show the image like this imshow(Y,colormap(gray(32))); but that will just show the image with 32 levels and i want to save it in a variable not just showing it off

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Image Analyst
Image Analyst 2015-4-27
Use imquantize() or just divide the image by 8.
Y32 = Y / 8;
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soe
soe 2018-1-4
For image Y, to convert from 256 levels to 32 levels, the values should be 0 to 31. But Y/8 may be 0 to 32. (e.g. 255/8 = 31.875 becomes 32). So, how can i solve this problem?

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