how to convert 24 bit depth images into 8 bit depth and 16 bit depth images.

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ajay kumar 2013-12-5

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评论： Image Analyst 2020-2-4

i have 24 bit depth images. but i need them in 8 bit depth and 16 bit depth format. can any one sugest how to convert them.

how to convert 24 bit depth images into 8 bit depth and 16 bit depth images.

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Answer 1

Image Analyst 2013-12-5

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Is your 24 bit depth image a color image? Probably because there is no 24 bit integer in MATLAB. There is a 32 bit signed integer and you may be using up only the lower 24 bits of that because your values only go from 0 to 16,777,215. If you have that situation then divide by 256 to get 16 bit integers or divde by (256*256) to get uint8 images. There are other ways , to convert an integer gray scale image , such as using mat2gray or simple scaling:

image8bit = uint8(255 * mat2gray(image24bit))

This scaled between the max and min of the image rather than using a fixed range like dividing by 256 will do. It just depends on what range you want your output in.

Or if you have a 24 bit color RGB image , you can use rgb2gray:

image8bit = rgb2gray(rgbImage);

or take out just one color channel

image8bit = rgbImage(:, :, 2); % Extract the green channel.