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Color correction
Color grading is a post-production process common to filmmaking and video editing of altering the appearance of an image for presentation in different environments on different devices. Various attributes of an image such as contrast, color, saturation, detail, black level, and white balance may be enhanced whether for motion pictures, videos, or still images. Color grading and color correction are often used synonymously as terms for this process and can include the generation of artistic color effects through creative blending and compositing of different layer masks of the source image. Color grading is generally now performed in a digital process either in a controlled environment such as a color suite, and is usually done in a dim or dark environment.
The earlier photochemical film process, referred to as color timing, was performed at a film lab during printing by varying the intensity and color of light used to expose the rephotographed image. Since, with this process alone, the user was unable to immediately view the outcome of their changes, the use of a Hazeltine color analyzer was common for viewing these modifications in real time.
Post audio
In filmmaking, audio post production is the creation and manipulation of audio that is synchronized with moving picture. This includes, but is often distinguished from production audio, which is the audio recorded as filming occurs.
Most other aspects of audio for moving picture occur during the post production phase, everything done after filming. This also may include sound design or the creation of sound effects, which can occur during pre-production, production, or post production. This applies to television, cinema and commercials. One major aspect of audio post production is the use of automatic dialogue replacement (ADR).
Sometimes the original production audio lacks in performance or quality, and one or more actors work in a sound studio to record some or all of their dialogue from the project. Other elements such as Foley, music and voiceover are also added during post production.