Class Name: CMY Colour

Superclass - <Colour Data>

Subclasses

Definition

An instance of this DRM class specifies the actual cyan, magenta, and yellow data values for a colour defined within the CMY colour model. These values shall be in the range [0.0, 1.0].

NOTE  The CMY colour model is closely related to the RGB colour model. Cyan is the complement of red (cyan = 1.0 - red); magenta, of green (magenta = 1.0 - green); and yellow, of blue (yellow = 1.0 - blue)

Primary Page in DRM Diagram:

• 14

Secondary Pages in DRM Diagram:

Example

1. A <CMY Colour> instance representing pure black has a cmy_data field with a value of cyan = 1.0, magenta = 1.0, yellow = 1.0.

2. A <CMY Colour> instance representing red has a cmy_data field with a value of cyan = 0.0, magenta = 1.0, yellow = 1.0.

FAQs

How can a data consumer who does not use the CMY colour model retrieve the colour values in the colour model he or she does use?

The specific procedure to be followed depends on the colour model used by the consuming application.

If the data consumer uses a colour model directly supported by the DRM, the Level 0 API can be instructed to change all <Colour Data> instances to the desired colour model before any <Colour Data> instances are retrieved.

Otherwise, the Level 0 API can be instructed to change all <Colour Data> instances to an appropriate colour model before any <Colour Data> instances are retrieved, and upon retrieval the consuming application can invoke the appropriate utility function provided in the DRM API to convert to the desired colour model.

Where can users go for further information on colour in the DRM?

See P4V8 of the SEDRIS Documentation Set for further information.

Constraints

• <<Publishable Object>>

Composed of (two-way)

• zero or one <CMY Colour Control Link> instance

Component of (two-way) (inherited)

• zero or more <Ambient Colour> instances
• zero or more <Diffuse Colour> instances
• zero or more <Emissive Colour> instances
• zero or more <Specular Colour> instances

Inherited Field Elements

Field Elements

Notes

Fields Notes

cmy_data

The cmy_data field specifies the CMY colour coordinate. For a <CMY Colour> instance with a <CMY Colour Control Link> component, the value of the cmy_data field is obtained from the control link.