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Check exposure and colour casts with the FFmpeg waveform monitor
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What this guide covers
For editors and colourists who already use FFmpeg and want a quick exposure and colour-cast scope without opening a grading application. They end up with a plotted waveform of a clip and a way to read it correctly for RGB or YUV footage. It is based on the FFmpeg manual only and no command was run.
More about this guide
Guide ID: art_01M6V1ZWB1JQ9TPT3EP7AJQ65X
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Guide title
Check exposure and colour casts with the FFmpeg waveform monitor
Coverage
For editors and colourists who already use FFmpeg and want a quick exposure and colour-cast scope without opening a grading application. They end up with a plotted waveform of a clip and a way to read it correctly for RGB or YUV footage. It is based on the FFmpeg manual only and no command was run.
Example
A hypothetical white-wall shot, not run: after converting to RGB the wall should plot three traces at about the same height, and a lower blue trace would suggest a warm cast.
Useful starting points
- Find out whether your clip is RGB or YUV before trusting a red, green and blue reading; most mp4 files are YUV.
- Default settings mirror the plot, so bright values sit at the top. Check the orientation on a known black and white area.
- Only one trace appearing, or a plot that is too faint or too dense, usually comes from default option values rather than from your footage.
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