Is there a a function/code which can make the darker bits darker and the lighter bits lighter?

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just a random image I found on google. Is it possible to make the black parts (crack) darker and the background (concrete) lighter?

Answers (3)

Matz Johansson Bergström
Matz Johansson Bergström on 21 Aug 2014
If you have the image processing toolbox you can use imcontrast. http://www.mathworks.se/help/images/ref/imcontrast.html

Iain
Iain on 21 Aug 2014
Yup.
Calculate the difference from the image's mid level (128 probably, but this depends on how you're dealing with the image), and multiply it by a number greater than 1. Add that difference back to the mid level.
  2 Comments
Iain
Iain on 22 Aug 2014
Adjusted_Contrast = (Image - meanlevel) * scale;
Adjusted_Image = meanlevel + Adjusted_Contrast;
You need to change data types & values of mean level & scale, as you need.

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Image Analyst
Image Analyst on 22 Aug 2014
You can use imadjust() or just pass in the range you want to see into imshow().

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