 By modifying the compressed data directly without decoding and re-encoding, some editing of lossily compressed files without degradation of quality is possible.Editing which reduces the file size as if it had been compressed to a greater degree, but without more loss than this, is sometimes also possible.The primary programs for lossless editing of JPEGs are codice_1, and the derived codice_2 (which also preserves Exif information), and Jpegcrop (which provides a Windows interface).