artificial lighting/flash
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1. Photos made with artificial lighting (including flash) can be eligible to qualify for the TTG label.
Normal flash and other standard artificial lighting are so commonly used in information reportage that they usually would not warrant a separate alert by news agencies (in which case TTG photographers similarly need not provide an alert to viewers).
However, any lighting that produces an effect so unusual that respected international news agencies would make separate note of it in information-reportage contexts must be brought to viewers’ attention (by use of the TTG-IC version of the label) if the photograph is to be labeled TTG.
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2. But there are strict limits to how much the effects of flash and artificial lighting may be changed
After an exposure is recorded, as per “seen vs. simulated” and P7, apart from the effects of TTG’s Allowable Changes...
. . . any alteration, addition, or removal of shadows, reflections, catchlights, redeye, or other flash-induced phenomena disqualifies a photograph from TTG.
Such photographs cannot qualify for the TTG label.
This disqualification includes lighting effects (like those added instantly by smartphones) that misrepresent the lighting in the scene during the exposure(s).
See also the guide to flash photography