cmpermute - Rearrange colors in colormap
Syntax
[Y,newmap] = cmpermute(X,map)
[Y,newmap] = cmpermute(X,map,index)
Description
[Y,newmap] = cmpermute(X,map) randomly
reorders the colors in map to produce a new colormap, newmap.
The cmpermute function also modifies the values
in X to maintain correspondence between the indices
and the colormap, and returns the result in Y.
The image Y and associated colormap, newmap,
produce the same image as X and map.
[Y,newmap] = cmpermute(X,map,index) uses
an ordering matrix (such as the second output of sort)
to define the order of colors in the new colormap.
Class Support
The input image X can be of class uint8 or double. Y is
returned as an array of the same class as X.
Examples
Order a colormap by luminance.
load trees
ntsc = rgb2ntsc(map);
[dum,index] = sort(ntsc(:,1));
[Y,newmap] = cmpermute(X,map,index);
figure, imshow(X,map)
figure, imshow(Y,newmap)
See Also
randperm, sort
 | cmopts | | cmunique |  |
Includes the most popular MATLAB recorded presentations with Q&A sessions led by MATLAB experts.
Get the Interactive Kit
Store 
