How can I 'subtract' the brighter parts of an image without making it too [PDF]

Jun 9, 2016 - How can I 'subtract' the brighter... Learn more about ... Good day! I want to lessen or subtract the brighter part of an image without it being too unnatural. ... on 10 Jun 2016. You might want to use the "shadows and highlights" algorithm that Photoshop uses. I'm sure it's probably on the web somewhere.

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MATLAB Answers™ Related Content MATLAB Answers How to display an image in mm? 1 Answer 0

How can I 'subtract' the brighter parts of an image without making it too unnatural? Asked by c4mm11 on 9 Jun 2016 Latest activity Commented on by Image Analyst

on 10 Jun 2016

How to reduce sun brightness 1 Answer Thresholds for a thermal image 2 Answers

Good day!

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I want to lessen or subtract the brighter part of an image without it being too unnatural. I find thresholding [I(I>250) = 0] a bit awkward. I was hoping for the neighboring pixels to adjust, too. How can you do that?

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I am pretty new with image processing and I am using imgradient for edge detection of crystals but I want to omit information for brighter parts of the image (maxima). Here is an image of what I currently am working out.

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imgradient

remove bright part...

Thank you very much.

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1 Comment c4mm11 on 9 Jun 2016 Hi! Someone suggested using log, but it didn't do what I needed it to do since it just changes the brigtness of the whole image and not do it 'locally' to ''remove' the bright parts. http://i.imgur.com/OrJS3Vt.png Anyone?

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1 Answer

0 Link Answer by Image Analyst

on 10 Jun 2016

You might want to use the "shadows and highlights" algorithm that Photoshop uses. I'm sure it's probably on the web somewhere. https://www.google.com/#q=photoshop+shadows+highlights+algorithm

2 Comments c4mm11 on 10 Jun 2016 Thank you for the answer! I will check this out in a while. Just a quick question tho. I found out that what I want to do is similar with imhmax(I,h), but instead lower than h, I want to suppress higher than h. Is this possible?

Image Analyst

grayscale

on 10 Jun 2016

If it does what you want, then fine, but I have my doubts. See this link

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