Color space conversion xyz2srgb, using makecform function

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Jo
Jo 2015-6-4
编辑： Walter Roberson 2015-6-9
Hi
I have an image and try to convert it from XYZ to sRGB in order to display the image on the screen and be able to draw a ROI. I used the makecform function but it seems that it doesn't work well as I get a black image instead!
RGB=zeros(size(XYZ2));
cform=makecform('xyz2srgb');
RGB=applycform(XYZ2,cform);
Here are the max values of the XYZ and RGB matrices I get, respectively
max(max(XYZ2))
ans(:,:,1) = 31.6600, ans(:,:,2) =33.5200, ans(:,:,3) = 40.6900
max(max(RGB))
ans(:,:,1) = 1, ans(:,:,2) = 1, ans(:,:,3) = 1
Do you may have an idea? Did I use the cform function wrongly?
Many thanks in advance

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采纳的回答

Radha Krishna Maddukuri
This issue is happening because of scaling of the input data. The function 'xyz2srgb' expects input values in the range of 0 to 1.
Therefore, the input data can be scaled by dividing it with a standard value or the maximum value for the data.
clear
XYZ2 = [10 20 30; 40 50 60; 70 80 90; 100 110 120; 130 140 150; 160 170 180];
RGB=zeros(size(XYZ2));
cform=makecform('xyz2srgb');
RGB=applycform(XYZ2/180,cform);
I hope this helps you with the issue that you are facing.

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