how to save image in different bitdepth in matlab

In MATLAB, you can save an image with a different bit depth using the imwrite function. Here's an example:

main.m
% Read an image
img = imread('image.png');

% Save the image as a 16-bit grayscale image
imwrite(img, 'image_16bit.tif', 'tif', 'BitDepth', 16);

% Save the image as an 8-bit grayscale image
imwrite(img, 'image_8bit.png', 'png', 'BitDepth', 8);
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In this example, we first read an image using the imread function. Then, we save the image as a 16-bit grayscale TIFF image using the imwrite function. Finally, we save the same image as an 8-bit grayscale PNG image.

Note that the imwrite function takes additional parameters for specifying the file format (e.g., 'tif', 'png') and other settings such as compression. Also, please make sure that the specified bit depth is supported by the chosen file format.