How can I change the colors after generating an image in MATLAB?

In MATLAB, the colormap function can be used to change the colors of an image. Here is a simple example:

% 生成一幅灰度图像
image = rand(100, 100);

% 显示原始图像
subplot(1, 2, 1);
imshow(image);
title('原始图像');

% 使用热量图（hot colormap）来显示图像
subplot(1, 2, 2);
imshow(image);
colormap(hot);
colorbar; % 添加颜色刻度
title('改变颜色');

In the above example, the imshow function displays the original image and sets the colors to a heatmap using the colormap function. You can add a color scale next to the image using the colorbar function. You can choose different color mapping schemes as needed, MATLAB offers many predefined colormaps such as jet, gray, cool, and more.