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speed vs. output quality. Before the RGB image is
ready for viewing, the colors need to be transformed to
the desired output color space (e.g. for output on HD
displays, print on film or digital cinema projection) and
the tonal balance has to be adapted using the intended
contrast characteristic. The output RGB images are then
stored e.g. as 10 bit log dpx files, 16 bit tiff files, or other
file formats, depending on postproduction requirements.
ARRIRAW data can be processed in production
quality using the ARRI software tool Image
Booster or can be output by ARRIRAW T-Link
(see below) certified recorders and playback
devices as live HD preview or production quality
images depending on their specifications.
Note: Please check the Image Booster reference
for more information on ARRIRAW
processing and output options.
ARRIRAW Output
When set to ARRIRAW, an output board
delivers the raw data with:
2880 x 2160 pixels in 1.33:1 (4:3) aspect ratio
•
using the full sensor aperture up to 25 fps,
2880 x 1620 pixels in 1.78:1 (16:9) aspect ratio
•
using the full sensor aperture width up to 30 fps.
ARRIRAW signals require a dual link HD-SDI connection.
ARRIRAW T-Link
There are different source formats that can be sent
over a dual link HD-SDI connection. Next to 4:4:4 RGB,
SMPTE 372M also defines 4:4:4:4 RGBA (A for alpha
channel, see section: Chroma (Sub)Sampling above)
as a source format. The ARRIFLEX D-21 uses a special
transport method, which maps the 12 bit raw Bayer
data into this 4:4:4:4 RGBA signal so it can be sent to
the recording system via a dual link HD-SDI connection.
This method is called
ARRIRAW T-Link
(transport link).
ARRIRAW Recording
Any system capable of recording and playing back
an SMPTE 372M-compliant RGBA signal without
compression/encoding can be used to record this signal.
ARRIRAW T-Link certified recorders furthermore offer
real-time image processing (e.g. look up tables, image
resizing and cropping) for live preview on an HD monitor.
Data Mode Benefits
Best Image Quality
•
Data Mode output offers uncompressed, unprocessed
12 bit ARRIRAW data with the highest dynamic
range and lowest noise, allowing image quality to be
maximized through advanced image processing in post.
Aspect Ratio Range
•
The D-21 is equipped with a 1.33 (4:3) format sensor.
Data Mode on the D-21 allows output of this full sensor
image at full sensor resolution, extending the choice of
available aspect ratios.