DICOM PS3.3 2021d - Information Object Definitions

C.7.9 Palette Color Lookup Table Module (Current)
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### C.7.9 Palette Color Lookup Table Module

Table C.7-22 specifies the Attributes that describe the Lookup table data for images with Palette Color photometric interpretation.

When the Palette Color Lookup Table Module is present in an Image IOD, the conditional requirements for the use of Palette Color Lookup Table Data (0028,1201-1203) and Segmented Palette Color Lookup Table Data (0028,1221-1223), described in Table C.7-22, shall take precedence over the conditional requirements described in the Image Pixel Module (see Section C.7.6.3). When the Palette Color Lookup Table Module is present in a Presentation State IOD, the Palette Color Lookup Table Data (0028,1201-1203) Attributes are mandatory and the Segmented Palette Color Lookup Table Data (0028,1221-1223) shall not be present. When the Palette Color Lookup Table Module is present in a Color Palette IOD, either the Palette Color Lookup Table Data (0028,1201-1203) or Segmented Palette Color Lookup Table Data (0028,1221-1223) Attributes may be used.

When the Palette Color Lookup Table Module is present in a Color Palette IOD, the 3rd value of Palette Color Lookup Table Descriptor (0028,1101-1103) (i.e, the number of bits for each entry in the Lookup Table Data) shall be 8.

Table C.7-22. Palette Color Lookup Table Module Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Include Table C.7-22a “Palette Color Lookup Table Macro Attributes” |

Table C.7-22a. Palette Color Lookup Table Macro Attributes

Attribute Name | Tag | Type | Attribute Description
--- | --- | --- | ---
Red Palette Color Lookup Table Descriptor | (0028,1101) | 1 | Specifies the format of the Red Palette Color Lookup Table Data (0028,1201). See Section C.7.6.3.1.5 for further explanation.
Green Palette Color Lookup Table Descriptor | (0028,1102) | 1 | Specifies the format of the Green Palette Color Lookup Table Data (0028,1202). See Section C.7.6.3.1.5 for further explanation.
Blue Palette Color Lookup Table Descriptor | (0028,1103) | 1 | Specifies the format of the Blue Palette Color Lookup table Data (0028,1203). See Section C.7.6.3.1.5 for further explanation.
Palette Color Lookup Table UID | (0028,1199) | 3 | Palette Color Lookup Table UID. See Section C.7.9.1 for further explanation.
Red Palette Color Lookup Table Data | (0028,1201) | 1C | Red Palette Color Lookup Table Data. Required if segmented data is NOT used in an Image IOD or Color Palette IOD, or if the IOD is a Presentation State IOD. See Section C.7.6.3.1.6 for further explanation.
Green Palette Color Lookup Table Data | (0028,1202) | 1C | Green Palette Color Lookup Table Data. Required if segmented data is NOT used in an Image IOD or Color Palette IOD, or if the IOD is a Presentation State IOD. See Section C.7.6.3.1.6 for further explanation.
Blue Palette Color Lookup Table Data | (0028,1203) | 1C | Blue Palette Color Lookup Table Data. Required if segmented data is NOT used in an Image IOD or Color Palette IOD, or if the IOD is a Presentation State IOD. See Section C.7.6.3.1.6 for further explanation.
Segmented Red Palette Color Lookup Table Data | (0028,1221) | 1C | Segmented Red Palette Color Lookup Table Data. Required if segmented data is used in an Image IOD or Color Palette IOD; shall not be present in a Presentation State IOD. See Section C.7.9.2 for further explanation.
Segmented Green Palette Color Lookup Table Data | (0028,1222) | 1C | Segmented Green Palette Color Lookup Table Data. Required if segmented data is used in an Image IOD or Color Palette IOD; shall not be present in a Presentation State IOD See Section C.7.9.2 for further explanation.
Segmented Blue Palette Color Lookup Table Data | (0028,1223) | 1C | Segmented Blue Palette Color Lookup Table Data. Required if segmented data is used in an Image IOD or Color Palette IOD; shall not be present in a Presentation State IOD. See Section C.7.9.2 for further explanation.

#### C.7.9.1 Palette Color Lookup Table UID

This Attribute uniquely identifies a palette color lookup table set (red, green, blue).

### Note

This can be used to avoid reloading a palette if a system already has that palette loaded without examining all the data entries in the palette.

If this Attribute is present in a Color Palette IOD, it shall have the same value as the SOP Instance UID.

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DICOM PS3.3 2021d - Information Object Definitions