• This list is primarily for users of standalone cameras, as smartphones usually take care of these requirements automatically.

• As this list reveals, it is very difficult to make a TTG-qualified photo by combining multiple exposures of a scene that has movement in it.

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The List

In order for a combined-exposure photograph to meet the Trust Test, all of these must apply:

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1. In any situation that there is control over the combining of exposures, all exposures being combined to make the photograph must be started within the same single second, with no pictorial information added from exposures that did not begin during that one second (P5).

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2. The photo must depict one specific appearance that occurred during exposure, or satode (P4).

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3. There can be no repositioning or re-aiming of the camera or lens during or between successive exposures (P3).

Thus while panning is allowed for single-exposure photos, stitching together successive exposures recorded while panning disqualifies a photo from TTG.

(Photos made using the “Pano” setting on smartphones are always disqualified from TTG: there is no way to isolate the individual exposures that are combined to create those Pano images.)

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4. After combining exposures, there can be no ghost objects or stroboscopic motion effects (P4).

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5. Combined-exposure photos face the same sasibe limitations that single-exposure photos face (P4).

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6. All of the combined exposures must be recorded on one device, with one lens that is set at a single focal length. Focal-length blending and zooming during the exposure both disqualify the result from TTG (P3).

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7. After combining exposures, the photo held up to the Trust Test must be a “fixed” still image that appears the same to all who view it.

No viewer can see different lighting, focus points, depth of field, perspective, etc. than another viewer would see (P6).

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8. The result of any combined exposures must be focus maximized, with no smartphone-added “bokeh blur” (P3).

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9. The result of any combined exposures must be optically plausible (P3).

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10. The result of any combined exposures must meet P7.

Notes

• Even when exposures are combined, the various requirements in the Trust Test ensure that the result always looks like a single-exposure, undoctored photo.

• TTG makes no distinction between combining exposures or photographs “on the smartphone” vs. “in camera” vs. “in the darkroom” vs. “on a computer.” They are all treated equally.