The captured image from a camera is 12 bit but saved in the computer as 16 bit tiff image with postfix '0' bits. During capture, the pixel values don't exceed 4095 as should be with 12 bit images. But after saving the image and openning in Matlab, the "imview(image)" command shows 16 bit values, that is the pixels have values upto 65536. Is there any way to cut those extra 4 bits and make the image as 12 bits? It's very important that there shouldn't be any change in the original image.

Thanks in advance!