change image colormap in matlab

To change the colormap of an image in MATLAB, you can use the colormap function. Here's an example:

main.m
% Load sample image
img = imread('peppers.png');

% Show original image
subplot(1, 2, 1);
imshow(img);
title('Original Image');

% Apply new colormap
newmap = jet(256); % Example colormap
colormap(newmap);
colorbar;

% Show image with new colormap
subplot(1, 2, 2);
imshow(img);
title('Image with New Colormap');
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In this example, we first load a sample image (peppers.png). We then show the original image in a subplot (subplot(1, 2, 1)).

Next, we create a new colormap (newmap) using the jet colormap function with 256 values. We apply this new colormap to the image using the colormap function.

Finally, we show the image with the new colormap in the second subplot (subplot(1, 2, 2)) and add a colorbar to show the new colormap (colorbar).

You can replace jet(256) with any other colormap function or custom colormap matrix to change the colormap of your image.