This page is an entry in the Key.
(also called “tones and colors”)
Every depiction in every photograph is either “light”-related or non-“light”-related (most depictions of things in photographs contain both aspects).
The two aspects behave very differently from each other — with significant implications regarding “viewer trust.”
Numerous related specific subcategories, tools, and actions are covered by the term “light-related changes” in the Allowable Changes list, such as
• converting a film negative to a positive
• converting a color photo to black-and-white
• highlight detail
• shadow detail
• white balance
• color balance
• tonal relationships in monochrome (black-and-white) photographs
• various other light-related items (including most of the options on the Image > Adjustments menu in Photoshop and their corollaries in similar programs).
“Photoshop” is a registered trademark of Adobe Systems Inc.