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Re: saving a NxM matrix as a color-mapped image of size NxM


From: lynx . abraxas
Subject: Re: saving a NxM matrix as a color-mapped image of size NxM
Date: Wed, 12 Dec 2012 13:44:15 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

Dear James,


Many thanks for Your hint.
On 11/12/12 16:45:18, James Sherman Jr. wrote:
> I think the problem is that your original image (mHist2d) is of type
> double, but imwrite expects type uint8, so what happens if you try:
> 
> imwrite(uint8(mHist2d), colormap(cmap), "test.png", "png");

True. It seems that the hist values have to be between [1;256] and only [1;256] 
from cmap are used.
Attached is a small test script in case someone has the same problem.

Many thanks again
Lynx


Attachment: test_save_imagesc_01.m
Description: Text document


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