What is the difference between the "Exposure" and "Brightness" controls in Adobe Camera Raw? I'm sure there must be something subtle going on, but I can't tell what.
"Exposure and Shadows set the white and black endpoints, respectively. Brightness adjusts the midpoint. Contrast applies an S-curve around the midpoint set by Brightness, darkening values below the midpoint and brightening those above.
The Exposure slider controls the mapping of the tonal values in the image to those in your designated working space, but it’s first and foremost a white-clipping adjustment. Remember—because of the linear nature of digital capture, half of the captured data is in the brightest f-stop, so Exposure is a highly critical adjustment."
Comments
"Exposure and Shadows set the white and black endpoints, respectively. Brightness adjusts the midpoint. Contrast applies an S-curve around the midpoint set by Brightness, darkening values below the midpoint and brightening those above.
The Exposure slider controls the mapping of the tonal values in the image to those in your designated working space, but it’s first and foremost a white-clipping adjustment. Remember—because of the linear nature of digital capture, half of the captured data is in the brightest f-stop, so Exposure is a highly critical adjustment."
See the full discussion here (PDF):
http://wwwimages.adobe.com/www.adobe.com/digitalimag/pdfs/phscs2ip_camraw3.pdf
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