Adding constant if the pixel intensity is greater than 50?

Hello, I am new to Matlab, I would like to check every pixel in 16 bit image, If the pixel intensity is less than 50 its fine but if the intensity is greater than 50 in certain pixels, I should add that particular pixel with a constant and proceed to the next. The aim is to produce a new image by adding 2000 to the pixel Intensity>50, leaving pixel Intensity<50 unchanged. My Image size is 480x640; Thank You very much,

[Walter Roberson]

How do you intend to view the image? Are you using uint16 images?

Is it possible you meant add 200 rather than 2000? Even so, what result would you like for the places that start with at least 56, after which adding 200 would reach the limit of 255 for uint8 images.

Answer 1

[David Young]

Assuming your image is stored in a variable called img:

highValues = img > 50;
img(highValues) = img(highValues) + 2000;

You don't say what you want to do with values equal to 50. The code above leaves them unchanged.

[Walter Roberson]

Note that if your image is uint8 then adding 2000 to the values will saturate the pixels giving 255. There is no way for uint8 to represent values over 2000.

[Writer]

Thank you very much David Young It worked :)

[Writer]

Dear Walter Roberson I want to do this on 16 bit Image, May be I did not mentioned it clearly in my question. Thanks for the comments :)