Quantize a greyscale Image by 5 levels?

I would like to quantize an image by 5 levels without using the imquantize command. Given any a grayscale image on a scale of [0,255] this should be possible. Thanks in advance for your time and help.

Answer 1

[Walter Roberson]

Q = floor(YourArray ./ (256/5));

[Twain Glaser]

Thanks!

Answer 2

[Image Analyst]

Use imquantize:

Description
example
quant_A = imquantize(A,levels) quantizes image A using specified quantization values contained in the N element vector levels. Output image quant_A is the same size as A and contains N + 1 discrete integer values in the range 1 to N + 1 which are determined by the following criteria: