“One fixed image”
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1601. What’s the point of P6?
In light of Characteristic #6 of trusted photographs, P6 ensures that the photograph is a single, fixed, “still” photograph.
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1602. Why does TTG require that images held up to the Trust Test be in a “fixed,” capable-of-being-printed format?
Because that’s the only way to ensure that a visual image will look the same to all viewers. Viewers have to be confident that they are seeing the exact same version of the same image that was held up to the Trust Test.
A side benefit of photographs that are “capable of being printed” is that they fulfill multiple factors in photography’s role as a universal language, but that was not the impetus behind P6.
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1603. But no photograph ever has to be printed before it can qualify for the TTG label?
That is correct. No photograph ever needs to be printed before it can qualify for the TTG label (most TTG photographs will never be printed).
The “capable of being printed” requirement is in P6 only to help clarify the characteristics of TTG-eligible images.
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1604. And the image being held up to the Trust Test need not have been recorded as a conventional “still” photograph?
That is correct. Individual frames taken from a movie, a video, a .gif, a “Live” image, or from other visual-imaging technologies can be eligible to qualify for the TTG label if they meet all of the requirements of the Trust Test.
Note, however, that no part of a camera- or phone-generated [sweep] “panoramic” photograph is eligible for TTG, because it isn’t possible to separate individual frames and thus the result couldn’t get past P3.
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1605. Does P6 disqualify stereoscopic and 3D images?
Yes, although single frames from such images may be eligible to qualify as TTG.
More
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1606. Does P6 disqualify all images in which “computational” technologies allow the viewer to change the lighting, focus, depth of field, perspective, and the like?
Yes, P6 disqualifies any image that does not permanently “look the same to all viewers.”
TTG does allow for computational technologies in photography, most notably in allowances for various smartphone technologies.
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1607. But why are “computational” revisions by the viewer to the lighting or whatever in a TTG photograph treated differently than other changes viewers might make to such photographs?
They are not treated differently.
Even when there is nothing “computational” involved, anytime anyone makes ANY non-Allowable changes to a photograph that is already labeled TTG
— then the original photographer’s Guarantee no longer applies to the revised image.
That includes any words on the photograph.
See also the “P6” tab on the page “What the public knows about how undoctored photographs work”
The numbering of the FAQ questions will not change — any new questions are added at the bottom and given new numbers — so users can safely make a link to any specific question.