Apple Final Cut Pro 5 - Manual (Page 1341)

554 Part III Output
Color Space and Bit Depth Precision Options
 Always Render in RGB: Forces codecs that normally process color using the Y´C
B
C
R
(YUV) color space to process using the RGB color space instead. If selected, this
option may cause subtle changes in color in your rendered material. If the video
codec you’re using doesn’t support Y´C
B
C
R
rendering, this option is unavailable.
Use this option if you want to accomplish a specific compositing task and you think
color clamping in the RGB color space might give you a preferred result over using
the straight Y´C
B
C
R
color space. For example, if you’re mixing After Effects filters,
which process only in RGB color space, with Final Cut Pro filters, which process in
Y´C
B
C
R
color space, choosing this option ensures a consistent look.
 Render in 8-bit YUV: Enables 8-bit rendering using the Y´C
B
C
R
color space. This option is
appropriate for footage captured from DV-25 source material, such as DV and DVCAM
tape, or for third-party video interfaces that capture 8-bit video in the Y´C
B
C
R
color
space using an appropriate Y´C
B
C
R
-compatible codec. However, if you are doing any
compositing or adding filters, you may want to use high-precision processing instead.
 Render 10-bit material in high-precision YUV: Enables 32-bit floating point rendering
using the Y´C
B
C
R
color space. This is appropriate for footage captured from third-
party video interfaces that capture 10-bit video in the Y´C
B
C
R
color space using an
appropriate Y´C
B
C
R
-compatible codec.
Third-party video interfaces capable of 10-bit, Y´C
B
C
R
video let you capture media
files with much finer color detail, as well as greater latitude from blacks to whites,
than do 8-bit sources. Final Cut Pro can capture and output from such a card using
this higher level of quality, and selecting this option enables certain effects such as
transitions and filters to be rendered at this quality.
 Render all YUV material in high-precision YUV: Enables 32-bit floating point processing
even when using 8-bit media files. In certain situations, such as when applying
multiple filters to a single clip, 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
trade-off is that 32-bit rendering is slower than 8-bit rendering, so you’re essentially
trading speed for quality.
Selecting this option does not add quality to clips captured at 8-bit resolution when
output back to video; it simply improves the quality of rendered effects that support
10-bit precision.