DCI Specs - Digital Cinema Initiatives
DCI Specs - Digital Cinema Initiatives
DCI Specs - Digital Cinema Initiatives
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Image ParametersNominal(Projected Image)Tolerances(ReviewRooms)Tolerances(Theatrical)Pixel Count 2048 x 1080 or 4096 x 2160 N/A N/ALuminanceUniformity, cornersand sidesCalibrated WhiteLuminance, centerCalibrated WhiteChromaticity, centerfrom code values[3794 3960 3890]Color Uniformity ofWhite Field, corners85%of center48 cd/m²(14 fL)80% to 90%of center±2.4 cd/m²(± 0.7 fL)70% to 90%of center±10.2 cd/m²(± 3.0 fL)x=.3140, y=.3510 ±.002 x, y ±.006 x, yMatches center±.008 x, yRelative tocenter±.010 x, yRelative tocenterSequential Contrast 2000:1 minimum 1500:1 minimum 1200:1 minimumIntra-frame Contrast 150:1 minimum 100:1 mininum 100:1 mininumGrayscale TrackingContouringNo visible color shadingContinuous, smooth ramp, withno visible stepsTransfer Function Gamma 2.6Color GamutColor AccuracyMinimum Color Gamut enclosedby white point, black point 11 andRed: 0.680 x, 0.320 y, 10.1 YGreen: 0.265 x, 0.690 y, 34.6 YBlue: 0.150 x, 0.060 y, 3.31 YColorimetricMatchNo visible colorshading(same)± 2% 10Per component(same)No visible colorshading(same)± 5% 11Per component(same)+/- 4 delta E 12 +/- 4 delta E 12Table 11: Reference Image Parameters and Tolerances8.3.4.8. Intra-frame (Checkerboard) ContrastWith the spot meter placed at the reference viewing position, measure the luminancelevels of each of the patches in the checkerboard test pattern. Intra-frame contrast iscomputed by summing the luminance of the white patches and dividing by the sum ofthe luminance of the black patches. Infra-frame contrast is reduced by many factorsincluding projection lens flare, port glass flare, ambient light spilling on the screen andback-reflections from the room itself. Note that this measurement is made with theprojector in situ, with the screening room or theater in full operating mode.8.3.4.9. Grayscale TrackingUsing the black-to-white gray step-scale test pattern described in Table 12: Black-to-White Gray Step-Scale Test Pattern Code Values, Luminance Values, and ChromaticityCoordinates, the entire step-scale should appear neutral without any visible color non-10 Least squares fit of slope of a log/log plot of measured luminance vs. input code value, using a range from peak whiteluminance down to 5% of peak white.11 The luminance of the black point is limited by the sequential contrast ratio of the projector plus the ambient light fallingon the screen.12 Delta E is color error, defined as the geometric sum of delta u’ and delta v’ (square root of sum of squares).<strong>DCI</strong> <strong>Digital</strong> <strong>Cinema</strong> System Specification v.1.2 Page 84