jpx_layer_target::access_channels

Provides an interface which may be used to specify the relationship between code-stream image components and colour reproduction channels (colour intensity channels, opacity channels, and pre-multiplied opacity channels). This information is used to construct appropriate Component Mapping and Channel Definitions boxes, but is provided in a manner which conceals most of the mess associated with those boxes.

It is NOT NECESSARY to access or initialize the jp2_channels object directly; the default behaviour is to assign colour intensity channels to the initial code-stream image components in order.