Filters provide “knowledge” of a given asset type to Cumulus. They are, in fact, what enables the program to offer enhanced metadata support for so many file formats. For example, the JPEG filter knows to parse incoming JPEG assets for information common to that file type, such as horizontal and vertical dimensions (and much more). The MP3 filter extracts audio-related metadata, such as length and sample rate. Filters are like plug-ins—they can be added, activated and deactivated at any time. The Cumulus SDK (software development kit) enables others to create custom filters.