CODEWITHSUNDEEP
matlabimage-processing
user268914
user268914

Reputation:

How can I decrease a picture's brightness levels in MATLAB?

How can I decrease a picture's brightness levels in MATLAB? For example from 256 (in 8-bit pictures) to 10?

Upvotes: 2

Views: 1414

Answers (2)

aardvarkk
aardvarkk

Reputation: 15996

I would recommend the following code, which may accomplish what you're looking for more directly:

srcBitDepth = 8;
dstBitDepth = 2;

img = imread('cameraman.tif');
subplot(1,2,1); imshow(img,[]);

img = bitshift(img, dstBitDepth-srcBitDepth);
subplot(1,2,2); imshow(img,[]);

Here's the result:

Bit reduction

Notice the bit reduction from an original 8-bit image to a 2-bit image.

Upvotes: 3

Jonas
Jonas

Reputation: 74940

To convert an image from X graylevels into an image with Y graylevels, you can write

modifiedImage = round( double(rawImage)/X * Y);

Then you can convert modifiedImage to the integer format of your choice, e.g. uint8

modifiedImage = uint8(modifiedImage);

Upvotes: 2

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