Input and output pins

Filters send and receive data through pins. These pins come in two flavours:

1. Input pins, where filters receive input data before the filter is rendered, and;
2. Ouput pins, where filters push output data after the filter has been rendered.

Input pins are displayed on the left-hand side of a filter, and output pins are displayed on the right-hand side of a filter, as shown below:

A filter with four input pins (left) and one output pin (right).

Input and output pins behave differently in some ways, as described below:

• You can manually edit the value of an input pin if it is not connected to another pin.

• You cannot manually edit the value of an output pin. The value of an output pin is always and exclusively set by its parent filter.