Graphics Reference
In-Depth Information
A single-body imaging system houses both L and R imagers in a single unit
sharing optics, electronics and other common elements. As with rigs, single-body
systems can capture action as a video stream or as a succession of individual
frames. As single-body rigs are intended for greater mobility and ENG-style work,
they also tend to favor onboard capture to media in a compressed video stream.
The trade-off of single-body imagery compared to rigs is that image resolution
is typically lower and image compression higher than in rig setups.
Raw vs. Compressed vs. Proxy Imagery
This distinction refers to resolution of the imagery. 3D uses the same i le formats
(TIF, DPX, JPG, for example) and video formats (QuickTime, for example) as
2D. Video compression is a complex subject in itself and outside the scope of
this topic. More important for our discussion is the distinction between RAW,
compressed and proxy imagery.
RAW
RAW (also known as “camera RAW”) refers to data captured at the highest
possible resolution for the particular imaging system. In practice all imagery
(even RAW imagery) goes through some level of compression in order to
reduce the amount of visual information from the real world scene to a rate
that makes sense to digital tools with limited bandwidth and data rates.
RAW imagery is rarely used “as is,” although some editing systems use a
variety of software and hardware acceleration to allow real-time playback
of RAW files.
More often RAW is converted/transcoded to an intermediate or proxy format
to enable real-time review (e.g., as dailies) and post work. During the conform
process (part of the editorial workl ow) the conform system links back to
higher-res (including RAW) versions of the imagery prior to i nishing and
delivery.
Compressed
Compressed imagery is imagery that has been treated so that it creates smaller
data packages. Typically, this results in a lower resolution record of the imagery
compared to a so-called RAW record. (Although, as we stated above, even RAW
imagery has had some level of compression applied to it.) Compressed imagery
can be used as a basis for i nal 3D deliverables.
 
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