C.7.6.23.4 Blending LUT Transfer Function

The value of the Blending LUT 1 Transfer Function (0028,1405) and Blending LUT 2 Transfer Function (0028,140D) specify the algorithm used to determine the output values of the Blending LUT 1 and Blending LUT 2, respectively.

Enumerated values:

CONSTANT A constant floating point value from 0.0 to 1.0, inclusive.

ALPHA_1 Pass-through the Alpha 1 input value from the Alpha Palette Color Lookup Table of the Primary data path.

ALPHA_2 Pass-through the Alpha 2 input value from the Alpha Palette Color Lookup Table of the Secondary data path.

TABLE The output of a Table defining a function of the Alphas from both data paths: The Alpha 1 input value from the Alpha Palette Color Lookup Table of the Primary data path and the Alpha 2 input value from the Alpha Palette Color Lookup Table of the Secondary data are concatenated to form an index into a Lookup Table, with the Alpha 1 value providing the most significant bits of the index and the Alpha 2 value providing the least significant bits of the index.

If the index is too large for the number of entries in the Lookup Table, the last value of the Lookup Table is used for any index value greater than the number of Lookup Table entries. If the index is too small for the number of entries in the Lookup Table, than not all entries in the Lookup Table are accessed. The total number of bits in the index value shall be equal to or less than 16.

ONE_MINUS The Blending LUT 2 value is (1 - Blending LUT 1 output). Used for Blending LUT 2 Transfer Function (0028,140D) only.