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Monday, June 07, 2010
8-bit, 10-bit, 32-bit, and more
Karl Soule | 06/07
Understanding Color Processing in Adobe Premiere Pro
Some formats, like DPX, have built-in presets for output that include this extra color precision:

Steve Hoeg, one of the Premiere Pro engineers, provided some examples of how Premiere Pro will handle color precision in different scenarios:
1. A DV file with a blur and a color corrector exported to DV without the max bit depth flag. We will import the 8-bit DV file, apply the blur to get an 8-bit frame, apply the color corrector to the 8-bit frame to get another 8-bit frame, then write DV at 8-bit.
2. A DV file with a blur and a color corrector exported to DV with the max bit depth flag. We will import the 8-bit DV file, apply the blur to get an 32-bit frame, apply the color corrector to the 32-bit frame to get another 32-bit frame, then write DV at 8-bit. The color corrector working on the 32-bit blurred frame will be higher quality then the previous example.
3. A DV file with a blur and a color corrector exported to DPX with the max bit depth flag. We will import the 8-bit DV file, apply the blur to get an 32-bit frame, apply the color corrector to the 32-bit frame to get another 32-bit frame, then write DPX at 10-bit. This will be still higher quality because the final output format supports greater precision.
4. A DPX file with a blur and a color corrector exported to DPX without the max bit depth flag. We will clamp 10-bit DPX file to 8-bits, apply the blur to get an 8-bit frame, apply the color corrector to the 8-bit frame to get another 8-bit frame, then write 10-bit DPX from 8-bit data.
5. A DPX file with a blur and a color corrector exported to DPX with the max bit depth flag. We will import the 10-bit DPX file, apply the blur to get an 32-bit frame, apply the color corrector to the 32-bit frame to get another 32-bit frame, then write DPX at 10-bit. This will retain full precision through the whole pipeline.
6. A title with a gradient and a blur on a 8-bit monitor. This will display in 8-bit, may show banding.
7. A title with a gradient and a blur on a 10-bit monitor (with hardware acceleration enabled.) This will render the blur in 32-bit, then display at 10-bit. The gradient should be smooth.
There are other examples, which I hope to highlight in my next blog entry.
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