Most digital compositors work with video, a perversely complicated medium. This complexity comes from the need to compress the video information as much as possible to lower the data rate for broadcast. This compression takes many forms and introduces issues and artifacts that we have to cope with when compositing visual effects in video. If you understand how the medium works you can prevent many problems from being introduced in the first place.
If you are working with a dedicated video system such as Flame it has design features built into it to make many of these issues transparent to the artist. However, if you are working with a “desktop” ...
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