White balance tool in Photoshop

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Matija
Matija 2014-3-12
评论： Image Analyst 2014-3-16
Hello all,
here I am with a rather complicated question:
do you know how white balance tool (eyedropper) in Adobe Photoshop works?
Thanks, MM.

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采纳的回答

Image Analyst
Image Analyst 2014-3-13
I have a crude white balancing program that works simply by linearly scaling each color channel independently. Photoshop probably does something more sophisticated but for what it's worth, I've attached it.
  2 个评论
Image Analyst
Image Analyst 2014-3-16
After playing around with Photoshop, it looks like you define a black point and a white point and it will set those to 0 and 255 respectively for each color channel. Then when you set the gray point, it uses a standard gamma curve formula to adjust the gray levels for each color channel such that the pixel you defined as gray will have red = green = blue = gray level on the line between the black point and white point. It should not be too hard to program that up in MATLAB. Give it a shot.
Image Analyst
Image Analyst 2014-3-16
By the way, if anyone wants code to launch Photoshop from MATLAB, see the attached m-file, below in blue.

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更多回答（2 个）

Laurent
Laurent 2014-3-13
Maybe it is better to ask your question in a Photoshop related forum. Anyway I don't think Photoshop will tell you the exact algorithm that they use, but I found some sites that explain what it does, for example this one: http://www.scantips.com/lights/flashbasics1f.html
Matija
Matija 2014-3-16
Hello all,
Laurent, yes, I was interested how Adobe does white balancing and I posted the same question on Photoshop forum...but without any useful reply.
Image analyst, yes, I am already using your version of white balancing algorithm :-)
Thank you!

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