White balance tool in Photoshop
显示 更早的评论
Hello all,
here I am with a rather complicated question:
do you know how white balance tool (eyedropper) in Adobe Photoshop works?
Thanks, MM.
采纳的回答
Image Analyst
2014-3-13
0 个投票
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
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
2014-3-16
By the way, if anyone wants code to launch Photoshop from MATLAB, see the attached m-file, below in blue.
更多回答（2 个）
Laurent
2014-3-13
0 个投票
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
类别
在 帮助中心 和 File Exchange 中查找有关 Contrast Adjustment 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
