C.32.2 Target Luminance Characteristics Module
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### C.32.2 Target Luminance Characteristics Module

This Module is a library of target luminance characteristics to be achieved in the calibration of specific configurations of specific Display Subsystems.

Table C.32.2-1. Target Luminance Characteristics Module Attributes

Attribute Name | Tag | Description
--- | --- | ---
Target Luminance Characteristics Sequence | (0028,7008) | Target luminance characteristics to which the Display Subsystem can be calibrated. One or more Items shall be included in this Sequence.
>Luminance Characteristics ID | (0028,7009) | Number that identifies this Luminance Characteristics item. The value shall be unique within the Target Luminance Characteristics Sequence (0028,7008).
>Display Function Type | (0028,7019) | The type of Display Function used to define the target luminance curve. See Section C.32.2.1 for Enumerated Values.
>Target Minimum Luminance | (0028,701D) | The minimum luminance value of the target luminance curve, in candelas per square meter (cd/m2).
>Target Maximum Luminance | (0028,701E) | The maximum luminance value of the target luminance curve, in candelas per square meter (cd/m2).
>Gamma Value | (0028,701A) | The Gamma value for generating the target luminance curve. Required if the value of Display Function Type (0028,7019) is GAMMA.
>Number of Luminance Points | (0028,701B) | The number of luminance points in the user defined target luminance curve. Required if the value of Display Function Type (0028,7019) is USER_DEFINED.
>Luminance Response Sequence | (0028,701C) | Luminance Response Values for the user defined target luminance curve. The number of Items shall match the value of Number of Luminance Points (0028,701B). Required if the value of Display Function Type (0028,7019) is USER_DEFINED.
>>DDL Value | (0028,7017) | The integer Digital Driving Level (DDL) for this luminance value. The DDL Value for the first item in the sequence shall be 0. The DDL Value of the last item in the sequence shall be the maximum DDL value. Two items in the sequence shall not have the same DDL value. The DDL Value of the items in the sequence shall increase monotonically.
>>Luminance Value | (0028,701F) | Luminance in candelas per square meter (cd/m2) corresponding to the DDL Value.
>Luminance Response Description | (0028,7020) | User defined text to describe the user defined target luminance curve.
>CIExy White Point | (0028,7018) | A single measured White Point recorded for the Display Subsystem. The white point is recorded as a CIE xy chromaticity with two dimensionless floating point values where the first is the x value and the second is the y value.
>Reflected Ambient Light | (2010,0160) | Reflected ambient light in candelas per square meter (cd/m2) when the measurements were taken.
>Ambient Light Value Source | (0028,7025) | Source of the reflected ambient light value. Enumerated Values: DEFAULT a configured default value was used. MEASURED the value was measured at the time of the other measurements. PROVIDED the value was provided by an external source. Required if Reflected Ambient Light (2010,0160) is present.

#### C.32.2.1 Display Function Type

Enumerated Values for Display Function Type (0028,7019):

GSDF

  Grayscale Display Function; see PS3.14.

CIELAB

  See CIE 1976 (L*,a*,b*) and CIELab Color Space by Gernot Huffman 1948.

GAMMA

  Luminance has a power law response curve.

LINEAR

  Luminance has a linear response curve.

LOG10

  Luminance has a logarithmic response curve

SRGB

  See "A Standard Default Color Space for the Internet - sRGB" - http://www.w3.org/Graphics/Color/sRGB.

USER_DEFINED

  Points of the luminance curve are defined by the user.

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