SMPTE Tutorial: Gray-Scale Transformations of Digital Film Data for Display, Conversion, and Film Recording

Kennel, Glenn; Snider, D.

doi:10.5594/j01652

Cited by 11 publications

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“…(48) can be rewritten by required bit depth for the gamma quantization using the CIE 1976 L * a * b * color difference model can be determined from both the dynamic range of tri-stimulus XYZ signals and the gamma value, γ, if the perceptual threshold, ΔEab, is given. Although the dynamic range of log 10 Dr = 3.2, which is a typical valueof the movie films[7], is employed in[5], the following evaluations for the optimum gamma value and the required bit depth extend the dynamic rang to 10,000:1 as described in Section 2.…”

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Comparative Study on Required Bit Depth of Gamma Quantization for Digital Cinema Using Contrast and Color Difference Sensitivities

Suzuki

Furukawa

2013

IEICE Trans. Fundamentals

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A specification for digital cinema systems which deal with movies digitally from production to delivery and projection on the screens is recommended by DCI (Digital Cinema Initiative), and systems based on this specification have been developed and installed in theaters. The parameters of the systems that play an important role in determining image quality include image resolution, quantization bit depth, color space, gamma characteristics, and data compression methods. This paper comparatively discusses a relation between required bit depth and gamma quantization using both of a human visual system for grayscale images and a color difference model for color images. The required bit depth obtained from a contrast sensitivity function against grayscale images monotonically decreases as the gamma value increases, while it has a minimum value when the gamma is 2.9 to 3.0 from CIE 1976 L * a * b * color difference model. It is also shown that the bit depth derived from the contrast sensitivity function is one bit greater than that derived from the L * a * b * color difference model at the gamma value of 2.9.

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confidence: 99%