Stanford Piano-Roll Scanner length-wise DPI calibration analysis
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ABCDEFGHIJKLMNOPQRSTUVWXYZAA
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Lower Calibrationfoot markerslowfastvery slowmediumvariableaverage
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Pixel positions in scan image of calibration roll (column B indicates the foot number)0154526157185154788154978154817
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1142526145180142792142978142808
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2130525133182130798130975130795
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3118522121172118797118972118783
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4106503109147106780106952106765
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59449597137947759494394762
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68247885122827608292882747
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77046073099707507091570723
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85845861092587575891258713
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94646849088467604689246697
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103445337063347533487534678
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112243925052227402285722673
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121042813037107381085210665
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Average:SD:
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Pixel distance between each foot marker1120001200511996120001200912,002.005.05
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2120011199811994120031201312,001.807.12
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3120031201012001120031201212,005.804.87
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4120191202512017120201201812,019.803.11
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5120081201012005120091200312,007.002.92
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6120171201512015120151201512,015.400.89
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7120181202312010120131202412,017.606.11
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8120021200711993120031201012,003.006.44
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9119901200411997120201201612,005.4012.60
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10120151202512007120171201912,016.606.54
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11120141201112013120181200512,012.204.76
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12120111201512002120051200812,008.205.07
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Average:12,008.1712,012.3312,004.1712,010.5012,012.6712,009.57
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SD:9.018.638.337.496.106.47
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Avg. of Avg:12,009.57Max:12025
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SD of All:8.33Min:11990
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vertical DPI:300.24Max DPI:300.63
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vertical DPI SD:0.21Min DPI:299.75
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340011.28125
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horiz. DPI:301.39
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Paper Luminosity:
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mean
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min
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max
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