[Octave-bug-tracker] [bug #49130] uint8 images are not shown correctly by imshow with gnuplot

[Rik]

Follow-up Comment #6, bug #49130 (project octave):

According to Matlab's documentation at
http://www.mathworks.com/help/matlab/ref/caxis.html.


index = fix((C-cmin)/(cmax-cmin)*m)+1;
%Clamp values outside the range [1 m]
index(index<1) = 1;
index(index>m) = m;


So it would appear that they use N rather than N-1.

It seems like the last bit, clamping, is an additional requirement for the
mapcdata function.  Otherwise, you can easily get negative values when cmin is
greater than C.


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