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Table 4 Chance performance in location task by manipulation type and overall based on mean number of subjects choosing the manipulated region in the original version of the image

From: Can people identify original and manipulated photos of real-world scenes?

Manipulation type Percentage correct by chance
Image
A B C D E F Overall
Airbrushing 19 31 28 28 23 20 25
Add/sub 24 5 15 3 3 1 9
Geometry 11 12 17 2 26 12 13
Shadow 20 16 28 39 4 5 19
Super-additive 74 63 44 72 33 26 53
Overall image 30 25 27 29 18 13 23
  1. For each of the six critical images and each of the five manipulation types, we show the probability that the manipulated region of the image was selected by chance in the original version of the image. The “Overall” column denotes the mean probability of selecting the manipulated regions for that manipulation type across all 6 images A-F. The “Overall image” is the mean probability of selecting the manipulated regions for that image across all manipulation types. Each image had a minimum of 101 responses