postprocessor

A postprocessor is a software component or module that converts data produced by an upstream process into a form tailored for a downstream system or stage. It often translates generic or platform-agnostic output into a format that a specific machine, device, or software expects, taking into account hardware constraints, dialects, and safety rules. Postprocessors are common in manufacturing, media processing, and software toolchains.

In computer numerical control (CNC) and computer-aided manufacturing (CAM), the term refers to a program that translates toolpaths into machine-specific instructions. The postprocessor accounts for the controller type, machine kinematics, tooling, coordinate systems, zero points, feed and speed formats, and safety cycles. It resolves differences among manufacturers (for example, Fanuc, Haas, Siemens), enabling the CAM system to generate valid G-code or other controller language for a particular machine. Postprocessors may be customized or supplied by the CAM vendor to match machine configurations.

In digital audio and video, postprocessing devices or software apply effects after initial processing, such as compression, equalization, noise reduction, color grading, or format conversion.

In other software pipelines, postprocessing might include data formatting, validation, or packaging for distribution.

The use of postprocessors improves interoperability and automation, but introduces maintenance needs: dialect changes, machine upgrades, or controller updates require updating the postprocessor; inaccuracies can cause machine errors or safety issues. Users typically select or customize a postprocessor as part of the CAM workflow or media pipeline.