Decreasing the size of video images to fit another format. Typically this reduces an HD format to an SD format and, as the input images represent over-sampled versions of output, the final quality should be excellent; often better than an SD-shot original. Moving from 1080/60I to 480/60I is down-resing. Technically the process involves: spatial interpolation to reduce size while retaining quality, color correction to compensate for the difference in HD and SD color standards and possibly re-framing to fit 16:9 HD onto 4:3 SD. Note that down-res does not include any change of frame rate.

See also: Down conversion, Format conversion, Standards conversion, Up-res, Versioning