Exports an input or output key of an object in the filter chain.
- macOS 10.5+
- Core Image
The key to export from the target object (for example,
The object associated with the key (for example, the filter).
A unique name to use for the exported key. Pass
nilto use the original key name.
When you create a
CIFilter object from a
CIFilter object, you might want the filter client to be able to set some of the parameters associated with the filter chain. You can make a parameter settable by exporting the key associated with the parameter. If the exported key represents an input parameter of the filter, the key is exported as an input key. If the key represents an output parameter, it is exported as an output key.