Originally Posted by
DanK
I think the question is confusing. "One adjustment" from what base? The image as captured by the camera is not even viewable. You can think of it as undeveloped film. So when you look at the image and start your adjustments, some adjustments have already been done. How many have been done, and what they are, depends on how you set the camera and the software you are using. If you are shooting jpeg, depending on the picture style, the camera has already adjusted white balance, other aspects of color balance, contrast, saturation, and sharpening. All of these are needed to render the image. If you shoot raw, the camera will not have made any adjustments, but the software has made adjustments in order to render the image. For example, it has to use a profile to render color, and with default settings, Lightroom will also adjust sharpening slightly.
Therefore, I would suggest a different term. Rather than thinking off these as "adjustments," which implies some unadjusted baseline, I suggest thinking of this as "choosing settings." Personally, I would never trust a preset algorithm to develop my images. Lots of choices will necessarily be made to turn the unviewable capture into a viewable image, and I would rather control them all myself. That's one reason I virtually never shoot jpeg.