422 3G YCbCr
3G is an improved HD-SDI format that can transmit signals over a
single cable which previously required two cables. It transports the
same signal as 422 1.5G YCbCr dual link, but over one cable with a
higher clock rate. REC OUT 1 and REC OUT 2 carry the identical signal
independently.
444 1.5G RGB
444 is still in the RGB color space, with each color at its full resolution.
This is important when chroma keying, as these composites rely on
color resolution.
444 1.5G is transmitted over two HD-SDI cables, with each cable
carrying part of the image data. It is important to
connect REC OUT 1 on the camera with record input 1 (or A) on
the external recorder and REC OUT 2 on the camera with record
input 2 (or B) on the external recorder
use matched lengths of HD-SDI cables for links 1 and 2
444 3G RGB
There are two types of 444 3G signal.
The single link version contains the same signal as the 444 1.5G
signal, but according to SMPTE 425M over a single cable.
The dual link version uses a proprietary image mapping for
frame rates from 30 to 60 fps, and is only currently supported by
certain recorders.
ARRIRAW* 1.5G DL
ARRIRAW is the proprietary raw data generated by ARRI cameras. Raw
data is the sensor image data before it is converted to RGB images. The
ALEXA has a single sensor with a Bayer pattern color filter array,
meaning that every pixel has only one channel of color information.
With normal HD images, the missing color channel information is
calculated from the adjacent pixels in the camera.
With raw data, this calculation is delayed until after the recording to
save bandwidth and creative options. Shooting ARRIRAW allows many
decisions on how to convert the images to be made in post-production.
ALEXA ARRIRAW specs:
Bayer pattern color coding
12 bit log luminance coding
No white balance applied
No exposure index applied
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