What is Pro P YUV (YCbCr) and RGB color spaces?

If I understand correctly, Premiere Pro handles colors and luminance in a variety of ways depending on what you do with the video.

For example, with cuts only edition, P Pro upsamples YUV (Y Cb Cr) video of its sampling frequency native native (4:2:2, 4:1:1, 4:2:0) in 4:4:4. Then converts this on-the-fly to RGB for display on computer monitors but retains the oversampled YUV for the current edition.

That said, when the application not YUV tag video effects or transitions, the YUV video is converted to RGB, the effects or transitions are applied and then it is converted into YUV lose some quality along the way. Fix? When working with YUV tagged effects, there is no intermediate conversion into RGB, which is a good thing.

But beyond that, all the video work in YCbCr color space? What happens when transcoding? Is there an optimal workflow?

Also, what the scope of the YCbCr Parade? The YC waveform, RGB Parade, and the Vectorscope are first intuitive largely because P Pro display and effects are WHAT RGB oriented (despite the many effects with YUV tags). So, what is the best use and approach when working with YCbCr Parade field?

Thank you

Jeff Sengstack

(1) the same treatment of color usually occurs during playback as an export. Where possible, we process and store the data YUV all the way up the screen where we will convert on the fly.

(2) only the elements of track containing non - YUV effects will be converted to RGB and only for non - RGB effects.

(3) information may be lost in two ways. First of all some YUV values will map to negative values greater than 255 RGB or RGB and they catch to these limits. Secondly a given value of YUV pixel may map to a fractional pixel RGB value how to round to the nearest. 32 bit floating point RGB is not either of these problems.

(4) many effects are directly working YUV. If you are looking for an example of chroma appears in the interface user of the effect, video limiter would be an example. How to make controls at an effect is not always directly correlated to how it is made. Use scopes to monitor the YUV values has several objectives. Most of the output formats are still YUV so you will monitor what will be your exit. Also depending on your target, ensuring the values of legal dissemination may be important. Of more if you try to adjust something like the brightness of a scene the luminance channel can be the most important to measure value.

Tags: Premiere

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