Update README.md

README.md

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 ![Screenshot](https://raw.githubusercontent.com/piersdeseilligny/metacolor.editor/master/screen1_both.png)
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 ## Why
 The Quicktime container and Prores codec are capable of specifying the color primary, transfer function, and color matrix to be used when viewing the file. However this information may be incorrect for a variety of reasons (Generally the tool used to encode the file was unaware or incapable of producing this data). This can result in ProRes videos being played back with inaccurate colors or post-production tools incorrectly transcoding them.