Apple Final Cut Pro 7 - Manual (Page 1461)

Always Render in RGB
If your sequence uses an RGB video codec such as Photo JPEG or Animation, this option
is always selected. However, if your sequence uses a Y
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codec, you can use this option
to process your footage using the RGB color space instead. For example, if you’re using
a filter that only processes in RGB color space in combination with filters that process in
Y
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color space, you can make the appearance of the Y
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filters more consistent
with that of the RGB filters by selecting this option. However, in most cases, you should
render using the native color space of your sequence’s codec.
Render in 8-bit YUV
Most codecs supported by Final Cut Pro use 8 bits per color sample, so this option is
usually selected by default. However, if you are doing any compositing or adding footage
with higher bit depths, you may want to use high-precision (32-bit) processing to maximize
quality.
8-bit YUV is the fastest Y
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processing option, so you may want to use this during
offline editing and then switch to high-precision rendering before rendering for output.
Render 10-bit material in high-precision YUV
Use this option whenever your sequence or source footage uses a 10-bit Y
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codec
such as the Apple ProRes 422 codec or an Uncompressed 10-bit codec. Several third-party
codecs also capture and output 10-bit video.
Render all YUV material in high-precision YUV
This is the highest-quality option for processing video in Final Cut Pro. This option
processes all 8- and 10-bit video at 32-bit floating point. In certain situations, such as
when applying multiple filters to a single clip or compositing several clips together, a
higher bit depth will improve the quality of the final render file even though the original
clip has only 8 bits of color information. The tradeoff is that 32-bit rendering is slower
than 8-bit rendering, so you’re essentially trading speed for quality.
Note: Selecting this option does not add quality to clips captured at 8-bit resolution when
they are output back to video; it simply improves the quality of rendered effects.
1461 Chapter 85 Rendering and Video Processing Settings