HISTEQ default not consistent with syntax?

2012 11 15
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If I have an 8-bit image IM (e.g. cameraman.tif), why does histeq(IM) produce a different result than histeq(IM,ones(1,256))??
Shouldn't they be identical? The description says hgram defaults to ones(1,n)*prod(size(A))/n. Since cameraman is 256x256 and n=2^8, shouldn't it scale normally?

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Matt Fig
Matt Fig 2012-11-15

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IM = imread('cameraman.tif');
I = histeq(IM);
I2 = histeq(IM,ones(1,64)*(numel(IM)/64));
isequal(I,I2)
ans =
1

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Jurgen
Jurgen 2012-11-15
I see it uses n=64 then, I was testing with n=256. Because of the description I was under the impression that n=length(HGRAM). Thanks for clearing that up.

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