save image with lower bit depth in matlab

You can save an image with lower bit depth in MATLAB by using the 'imwrite()' function with the appropriate settings. The following code shows how to save an image with 4-bit depth:

main.m
% Load the original image
I = imread('original_image.png');

% Convert the image to 4-bit depth 
I_4bit = uint8(floor(double(I)/16));

% Save the image with 4-bit depth 
imwrite(I_4bit, '4bit_image.png', 'Bitdepth', 4);
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In this code, the original image is loaded into the variable 'I'. The variable 'I_4bit' is then created by dividing the intensity values of the original image by 16 and rounding down to the nearest integer. This effectively reduces the number of intensity levels from 256 to 16. Finally, the 'imwrite()' function is used to save the image with a bit depth of 4.