color map and color data

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Anusha
Anusha 2013-10-17
回答： Walter Roberson 2013-10-18
If we change a color map of an image, the color data will automatically updated or not?
ADD
for example
[cdata cmap]=imread('');
[r c]=size(cmap);
colormap=cmap(1:r,:);%store the colormap
position=colormap;
i want code for if cmap i.e)colormap changes the cdata also automatically changes

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回答（2 个）

Vivek Selvam
Vivek Selvam 2013-10-17
Unless you give the modified color data to colormap() it would not be updated.
For example:
load flujet;
image(X); % default colormap 'jet'
c = colormap(hsv(128)); % update
c(c>0) = 1; % no update
colormap(c); % update
Walter Roberson
Walter Roberson 2013-10-18
cdata does not update when a colormap changes. When you are using pseudocoloring, cdata remains the same and is used to index into the active color map, with you being able to activate a new map.
For example,
cm = colormap(pink(128));
image(rand(64,64));
colormap(cm);
pause(10);
colormap(flipud(cm));
pause(10);
The cdata remains the same but what is painted changes when colormap() is called.

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