MATLAB: Write an image file

Question

i have a image im of uint16 datatype

figure(1), imshow(im)
figure(2), imshow(uint8(im))
figure(3), imshow(im,[])

all the above lines displays the image in different format

How to write the image in as obtained in 3rd figure format

Answer 1

You need to scale it to 0-255 first (which is what [] does), and then cast to uint8:

image8 = uint8(rescale(im, 0, 255));
imwrite(filename, image8);