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  • about the lightness of the patch you will use the palette to your right Notice how each grayscale chip has a number underneath it By moving the slider below the box you will change the number appearing on the computer screen behind the palette to one of these numbers corresponding to a grayscale chip value Try to find the grayscale value that most closely matches the target patch When you have found the closest match press the red button to lock in your match and move onto the next trial You are encouraged to look back and forth between the computer display and the palette several times before locking in your match however if you do please be sure to put your head in the chinrest when looking at the stimuli to ensure proper 3d perception There are three special values on the slider that do not appear on the palette If you shift the slider all the way to the right you will see Lighter than 9 5 but still a surface and further right from that is Glowing If you think that the square target patch looks lighter than the palette chip corresponding to 9 5 but that

    Original URL path: http://color.psych.upenn.edu/supplements/lightness_photo_geo/ExperimentPilotMatchInstructions.txt (2016-02-16)
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  • of contexts and the other will sit in front of the same context but be rotated such that it lies in the same plane as the other context Your task is to simply indicate which of the two squares looks lighter If you think the square on the left looks lighter press the left shoulder button on the controller if you think the square on the right looks lighter press

    Original URL path: http://color.psych.upenn.edu/supplements/lightness_photo_geo/Supplemental2AFCInstructions.txt (2016-02-16)
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  • Supplemental Material
    Munsell values range from 0 5 to 9 5 As noted in the manuscript there are three out of range values 1 Darker than 0 5 2 Lighter than 9 5 but still a surface 3 Glowing Note that for all observers the tab luminances are different between the binocular and monocular conditions For the binocular condition the tab luminances range is 0 63 261 86 cd m 2 For the monocular condition the tab luminances range is 0 58 238 39 cd m 2 Munsell values for our experiment may be converted to reflectances via this table First column is Munsell value second is reflectance third is log10 reflectance Plots Plot of binocular data for this observer PDF Plot of binocular set matched to monocular conditions for this observer PDF Plot of left eye data for this observer PDF Plot of right eye data for this observer PDF Tabulated Data Binocular condition Left eye condition Right eye condition 2AFC Experiment The files below provide individual observer data for each condition The files are tab delimited tables each 800 rows x 3 columns The first column indexes the stimulus condition in the order presented The indices indicate the following conditions for all observers except Observer A1 1 4 tabs in upper context reference tab is flat in plane reference luminance 1 23 5 53 24 91 112 28 cd m 2 5 8 tabs in upper context reference tab is rotated out plane reference luminance 1 23 5 53 24 91 112 28 cd m 2 9 12 tabs in lower context reference tab is flat in plane reference luminance 1 23 5 53 24 91 112 28 cd m 2 13 16 tabs in lower context refernece tab is rotated out plane reference luminance 1 23 5 53 24

    Original URL path: http://color.psych.upenn.edu/supplements/lightness_photo_geo/data2AFCExpObsA1.html (2016-02-16)
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  • Supplemental Material
    Munsell values range from 0 5 to 9 5 As noted in the manuscript there are three out of range values 1 Darker than 0 5 2 Lighter than 9 5 but still a surface 3 Glowing Note that for all observers the tab luminances are different between the binocular and monocular conditions For the binocular condition the tab luminances range is 0 63 261 86 cd m 2 For the monocular condition the tab luminances range is 0 58 238 39 cd m 2 Munsell values for our experiment may be converted to reflectances via this table First column is Munsell value second is reflectance third is log10 reflectance Plots Plot of binocular data for this observer PDF Plot of binocular set matched to monocular conditions for this observer PDF Plot of left eye data for this observer PDF Plot of right eye data for this observer PDF Tabulated Data Binocular condition Left eye condition Right eye condition 2AFC Experiment The files below provide individual observer data for each condition The files are tab delimited tables each 800 rows x 3 columns The first column indexes the stimulus condition in the order presented The indices indicate the following conditions for all observers except Observer A1 1 4 tabs in upper context reference tab is flat in plane reference luminance 1 23 5 53 24 91 112 28 cd m 2 5 8 tabs in upper context reference tab is rotated out plane reference luminance 1 23 5 53 24 91 112 28 cd m 2 9 12 tabs in lower context reference tab is flat in plane reference luminance 1 23 5 53 24 91 112 28 cd m 2 13 16 tabs in lower context refernece tab is rotated out plane reference luminance 1 23 5 53 24

    Original URL path: http://color.psych.upenn.edu/supplements/lightness_photo_geo/data2AFCExpObsA2.html (2016-02-16)
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  • you with type of judgments we d like you to make Here are three blocks to examine You can touch them or move them anywhere on the table and notice how their appearance changes with location or orientation You will have two minutes to look at these blocks As you look at any of the blocks you may notice that the amount of light reflected from the block appears to change as you move it or rotate it with respect to the light source On the other hand the block itself isn t changing as you move it the reflectance of the block itself is staying the same I d like you to examine the blocks now and get a sense of how the amount of light reflected to your eye appears to change as you move or rotate each block while realizing at the same time that the reflectance of the block itself is constant Wait for two minutes In the experiments we will be asking you to judge the dissimilarity between pairs of grayscale cards When you judge the dissimilarity please A judge the reflectance of the cards themselves rather than the amount of light that appears to

    Original URL path: http://color.psych.upenn.edu/supplements/mdslightness/InductionProcedure.txt (2016-02-16)
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  • of 30 would mean that the two grays appear extremely dissimilar At the start of the experiment we will show you an example of a pair of cards that we would like you to rate as 30 To make your response you will use the slider in front of you The screen in the middle will have the number corresponding to the current slider position Sliding the bar to the right will increase the value while sliding the bar to the left will decrease the value When the number on the screen matches your rating of the two cards press the button Before you started this experiment we had you examine wooden blocks and to notice that there can be a difference between how much light appears to reflect from objects on the one hand and how the objects are painted on the other A In this experiment we would like you to judge the reflectance of the cards rather than the amount of light that appears to reflect from them That is imagine that the two cards are presented side by side at the same slant under a common illuminant and judge how similar they would look in that

    Original URL path: http://color.psych.upenn.edu/supplements/mdslightness/Experiments/Experiment1-2Instructions.txt (2016-02-16)
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  • 6 6 0 Dim 7 1 0 Bright 8 2 0 Bright 9 3 0 Bright 10 4 0 Bright 11 5 0 Bright 12 6 0 Bright 13 1 42 Bright 14 2 42 Bright 15 3 42 Bright

    Original URL path: http://color.psych.upenn.edu/supplements/mdslightness/Experiments/1/Format.txt (2016-02-16)
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  • 2 7 5 6 16 14 10 16 7 12 17 7 3 2 1 4 8 8 2 5 8 9 26 15 8 17 18 12 11 9 3 3 1 2 7 7 10 3 7 12 15 16 18 10 14 12 5 1 9 6 6 8 1 1 5 7 18 10 24 18 21 16 11 11 14 4 3 4 9 4 3 1 1 4 10 4 21 17 19 16 12 11 16 8 4 4 1 3 13 5 2 2 1 5 22 21 16 13 18 13 11 9 6 10 5 6 9 4 2 0 1 2 28 21 23 23 16 18 22 13 10 7 9 10 9 10 4 2 1 2 25 28 21 22 14 16 13 13 12 9 7 11 22 12 10 2 2 3 29 24 26 12 21 12 9 12 22 13 22 21 15 25 27 30 30 29 1 1 6 8 6 6 11 10 17 21 20 23 17 16 8 27 30 30 29 1 5 5 7 3 16 8 12 14 21 19 15 19 22 27

    Original URL path: http://color.psych.upenn.edu/supplements/mdslightness/Experiments/1/RVX1-1.txt (2016-02-16)
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