“One moment”
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1501. What’s the point of P5?
In light of Characteristic #5 of trusted photographs, P5 ensures that every TTG-qualified photograph is the record of “one moment.”
That applies regardless of whether a moment is defined as “a very short period of time” (for TTG, “one second or less”) or as “any uninterrupted period of time.”
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1502. Why does TTG allow for combining exposures when news organizations traditionally did not allow it?
Because so many millions of smartphones now instantly combine multiple exposures to improve picture quality. More
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1503. But will the public trust news photographs that are made by combining exposures?
Presumably yes, as the public already trusts some news photographs that are made by combining exposures:
Anytime there is a citizen-supplied spot-news photo that was taken at night, there’s a good chance that it was taken with a smartphone that instantly combines multiple exposures.
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1504. Why is TTG’s list of “limits” so long for combining exposures?
The list is so long because there are numerous complexities that need to be spelled out for photos made with standalone cameras — things that are handled as a matter of course by smartphones.
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1505. Do TTG photographers ever need to combine exposures in order to meet the Trust Test?
No, combining exposures is never necessary to meet the Trust Test.
Any normal, functioning camera or device can capture a sufficient depth of focus and a wide enough dynamic range to meet the requirements of P7.
See also #884.
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1506. Why does P5 put a short time limit on combining exposures?
(See #2 P5)
There are two reasons for imposing a short time limit, one philosophical and one practical.
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1507. To eliminate the concerns in #1506 (about the scene changing between exposures), why doesn’t TTG allow a longer time limit for combining exposures when there is no motion or change in the scene?
Because doing so would mean that the photo would not have all 9 characteristics of trusted photos. It would also lead to widespread abuse.
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1508. Why is TTG’s limit for combined exposures in P5 “one second” instead of some longer period?
There are three reasons for the “one second” limit.
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1509. Besides the “one-second” limit in P5, what other limitations does TTG put on combined-exposure photographs?
Only the limitations imposed by the rest of the Trust Test, as explained in the guide to combining exposures.
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1510. Why does P5 say “No pictorial information may be added from exposures that did not begin during that one second” rather just saying “no combining of exposures that were not started in the same second”?
Because TTG allows for both dark-frame subtraction in digital photographs and for flashing when printing photographs on paper.
Both processes can happen outside of the one-second window without disqualifying the result from TTG; neither technique involves importing “pictorial information.”
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1511. What if the way I want to record a scene requires combining multiple exposures that start over a period of more than one second?
As implied in #1507 more, you will have to decide between recording the scene the way you want (and not worrying about TTG) vs. keeping the photograph eligible to meet P5 and qualify as TTG.
Numerous popular photographic actions routinely done in the digital era disqualify the resulting photos from TTG, including the three things listed in “A” of P2.
But any worthwhile standard like TTG will necessarily involve excluding some examples. See also #428.
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1512. What if I can imagine some bizarre ways of combining two exposures that begin in the same second, one very short and the other lasting much longer than one second?
Imagine away!
But remember that the image has to meet not only the four requirements in the last paragraph of P4; it also has to meet the rinairs standard for non-misrepresentation in P7 and the non-deception requirements of P8.
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1513. Instead of the sasibe standard and the satode test, why don’t the Trust Test just solve those problems by declaring a specific maximum exposure length for single-exposure photographs?
Sasibe | Satode | Sashimi
Because rinairs doesn’t declare a universal “maximum exposure length,” so any attempts to set such a length would run into a big problem.
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See also the “P5” 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.
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