what does it mean Error using image TrueColor CData contains element out of range 0.0 <= value <= 1.0

trying to work out wfusimg example in mathwork

ct=imread('grayplay900x900.jpg');
mri = imread('graygoogle900x900.jpg');

XFUSmean = wfusimg(ct,mri,'db2',5,'mean','mean');
XFUSmaxmin = wfusimg(ct,mri,'db2',5,'max','min');

colormap(maps);
subplot(221),image(ct),axis square, title('play')
subplot(222), image(mri),axis square, title('google logo')
subplot(223), image(XFUSmean),axis square, title('mean')

however it gives the error ,Error using image TrueColor CData contains element out of range 0.0 <= value <= 1.0

[Jan]

Please explain also, which line is concerned, because we cannot guess this detail.

[KSSV]

ct and mri both should be either RGB or binary. In your case I think they are not.

[Adam]

Surely the error is very self-explanatory?! It's hard to know how it could be any clearer.

Answer 1

[Jan]

The error message is clear: The command image is called with an agrument, which contains an RGB value outside the allowed range [0, 1]. Check this by using the debugger: Type this in the command line:

dbstop if error

Then run the code again. Matlab stops, when the error occurres. Then:

max(XFUSmean(:))   % Or which variable is concerned - I cannot guess this
min(XFUSmean(:))
class(XFUSmean)

What do you obeserve? The class double and values in the range of [0, 255]? Then divide the variable by 255 to get the standard image format.