DCDM ODT

[nullfrctl]

P3 ODT

Output Device Transforms - Rec.2020

DCDM

The output of this transform follows the encoding specified in SMPTE S428-1-2006. The gamut is a device-independent colorimetric encoding based on CIE XYZ. Therefore, output values are not limited to any physical device's actual color gamut that is determined by its color primaries.

The assumed observer adapted white is D60, and the viewing environment is that of a dark theater.

This transform shall be used for a device calibrated to match the Digital Cinema Reference Projector Specification outlined in SMPTE RP 431-2-2007.

P3D60 limited

This ODT encodes XYZ colorimetry that is gamut-limited to P3 primaries with a D60 whitepoint. This has two advantages:

1. "Gamut mapping" is explicitly controlled by the ODT by clipping any XYZ values that map outside of the P3 gamut. Without this step, it would be left to the projector to handle any XYZ values outside of the P3 gamut. In most devices, this is performed using a simple clip, but not always. If out-of-gamut values are left to be handled by the device, different image appearance could potentially result on different devices even though they have the same gamut.

2. Assuming the content was graded (and approved) on a projector with a P3D60 gamut, limiting the colors to that gamut assures there will be no unexpected color appearance if the DCP is later viewed on a device with a wider gamut.

The assumed observer adapted white is D60, and the viewing environment is that of a dark theater.

This transform shall be used for a device calibrated to match the Digital Cinema Reference Projector Specification outlined in SMPTE RP 431-2-2007.

P3D65 limited

This ODT encodes XYZ colorimetry that is gamut-limited to P3 primaries with a D65 whitepoint. This has two advantages:

1. "Gamut mapping" is explicitly controlled by the ODT by clipping any XYZ values that map outside of the P3 gamut. Without this step, it would be left to the projector to handle any XYZ values outside of the P3 gamut. In most devices, this is performed using a simple clip, but not always. If out-of-gamut values are left to be handled by the device, different image appearance could potentially result on different devices even though they have the same gamut.

2. Assuming the content was graded (and approved) on a projector with a P3D65 gamut, limiting the colors to that gamut assures there will be no unexpected color appearance if the DCP is later viewed on a device with a wider gamut.

The assumed observer adapted white is D65, and the viewing environment is that of a dark theater.

This transform shall be used for a device calibrated to match the Digital Cinema Reference Projector Specification outlined in SMPTE RP 431-2-2007.

ACES Specifications

• ACES transform ID
  urn:ampas:aces:transformId:v1.5:ODT.Academy.DCDM.a1.0.3
  urn:ampas:aces:transformId:v1.5:ODT.Academy.DCDM_P3D60.a1.0.3
  urn:ampas:aces:transformId:v1.5:ODT.Academy.DCDM_P3D65limited.a1.1.0

• ACES user name
  ACES 1.0 Output - DCDM
  ACES 1.0 Output - DCDM (P3D60 Limited)
  ACES 1.0 Output - DCDM (P3D65 Limited)