imshow with different colormaps in matlab

To display an image using a different colormap than the default one, you can use the colormap function in Matlab. After reading in your image using the imread function, you can display it using imshow and then set the colormap using the colormap function. Here's an example:

main.m
% Read in image and display using default colormap
img = imread('example.jpg');
subplot(1,2,1); imshow(img);
title('Original Image');

% Display with a different colormap
subplot(1,2,2); imshow(img); 
colormap('gray'); % Set colormap to grayscale
title('Grayscale Image');

% Add colorbar to the second subplot
colorbar;
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In the above example, we first read in an image and display it using the default colormap. Then, we display it again in a subplot with a different colormap (in this case, grayscale) using the colormap function. Finally, we add a colorbar to the second subplot using the colorbar function.

You can replace 'gray' in the above example with any other valid Matlab colormap name to display the image with a different colormap.