Non “light”-related aspects
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1. Non-“light-related aspects” = “forms and shapes”
• Non-“light”-related aspects are anything in a photograph that does not fall into the category “tones and colors.”
• Non-“light-related aspects” cannot be changed — except in a few allowed ways — or the photo is disqualified from the P2 of the Trust Test.
• Note that it isn’t just three-dimensional objects (cars, buildings, trees, people) that count as non-“light”-related aspects: anything that has a form or shape in photographic depictions is subject to the limits enumerated in part “B” of P2.
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2. TTG photographers quickly learn the difference between non-“light”-related aspects vs. “light”-related aspects of photos:
• Non-“light”-related aspects (forms and shapes) can only be changed in a few select ways in TTG photographs.
• But “light”-related aspects not only can but sometimes must undergo significant changes after a photo is recorded in order for the photo to not misrepresent the scene depicted (per P7); see this page for more.
Most depictions of things in photographs contain both aspects, non-light-related and light-related.
For more, see the Viewpoint page on “light”