CinePaint is a computer program to paint on and retouch bitmap frames of movies. It is used for motion picture frame-by-frame retouching and dust-busting. It is a free software used and distributed under the terms of GNU General Public License. The developers of CinePaint claim that it is the most successful open source tool for featuring motion picture work today. Its studio developers include Rhythm & Hues, Sony Pictures Imageworks, DreamWorks and ILM.

CinePaint has been successfully used in many feature films, including THE LAST SAMURAI where it was used to add flying arrows. CinePaint is different from other painting tools because it supports deep color depth image formats up to 32-bit per channel deep. For comparison, GIMP is limited to 8-bit, and Photoshop to 16-bit.
It comes with a feature called frame manager that sets CinePaint apart from its other photo-editing predecessor by providing onion skinning and working with 16-bit and floating point pixels.

Under its old name Film Gimp, CinePaint has so far been used for films such as Scooby-Doo, Harry Potter and Stuart Little.

Apart from conventional image formats (eg. JPEG, PNG, TIFF, and TGA) CinePaint also has support for specialised motion picture formats such as Kodak Cineon, ILM OpenEXR, Maya IFF and 32-bit TIFF.

CinePaint is compatible with Linux, Macintosh OS X, Windows, and other popular operating systems.