White Balancing in PS

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well here is an issue.

I understand that White Balance is the adjustment of color of all the pixels in pic, untill what is 100% white in reality is also 100% white in the image too.
The method I do this in Photoshop is to open either the Curves or Levels window, put the minus eyedropper on the area i want to give a white value and click.

3 questions.
1. am i doing the right thing?
2. obvioulsy the original color is cliped to a white value in accordance with the clip values set in the dialog box (0,50% per default). isn't it?
3. is that correction related to the percentage of the area to be turned white in the image (for example half the pixels are grey to be converted to white, other half are black ones to suffer along - in contrast of the case that only 10% of the pixels are grey, rest are black)
   will I be getting a true white in the first case and new shade of gray in the latter?

the practical application is that when i last shot the paintings for that friend of mine, i had totally forgotten the original colors to regain them after scanning. i used the minus eyedropper as mentioned above on a piece of white painted part of the image. Next time i intent to place the small Kodak white card next to the painting, and make according corrections. But using the above mentioned method, will white card size in respect to the painting size matter?

thanks, kostas


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