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Read exact pixel values in a region with FFmpeg pixscope
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What this guide covers
For editors and colourists who want to check colour and levels at a specific spot, such as a grey card, while playing a clip. You end with a movable scope showing sample values and statistics. It follows the FFmpeg manual only and was not run.
More about this guide
Guide ID: art_01M6W44QH62T9D0BF132WXHTHC
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Guide title
Read exact pixel values in a region with FFmpeg pixscope
Coverage
For editors and colourists who want to check colour and levels at a specific spot, such as a grey card, while playing a clip. You end with a movable scope showing sample values and statistics. It follows the FFmpeg manual only and was not run.
Example
A hypothetical grey card in the centre of a test shot, with the scope placed on it to see whether the channel values are neutral; no values were read.
Useful starting points
- The manual states a minimum supported resolution of 640x480; odd or missing output on a smaller source is the first thing to check.
- If the scope window covers the area you care about, move it with the window position options.
- Values can look wrong if the pixel format or range is not what you assume; check the format before trusting a reading.
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