Format Sensor
Mode
Reso-
lution
Color
Coding
Data
Rate
1
64 GB
SxS
PRO
1
XR
Capture
Drive
1
120 GB
CFast
2.0
1
DNxHD
115/120/
145
16:9 1920 x
1080
8 bit
YCbCr
115-
145
Mbit/s
72 min 255 min 132 min
DNxHD
175x/
185x/
220x
16:9 1920 x
1080
10 bit
YCbCr
175-
220
Mbit/s
48 min 170 min 87 min
DNxHD
444
16:9 1920 x
1080
10 bit
RGB
440
MBit/s
24 min 85 min 43 min
1
Data rate/recording time@24 fps
DNxHD is a fixed bitrate codec. The codec naming convention indicates
the codec’s project frame rate:
DNxHD 115 = 23.976/24 fps
DNxHD 120 = 25 fps
DNxHD 145 = 29.97 fps (30 fps is not available)
DNxHD 175x = 23.976/24 fps
DNxHD 185x = 25 fps
DNxHD 220x = 29.97 fps (30 fps is not available)
For a detailed table of available frame rates and possible codec/card
combinations, please refer to the Chapter FPS on page 70.
ARRIRAW
ARRIRAW data delivers unencrypted, uncompressed and
uncompromised image quality from an ALEXA camera. It offers the
highest achievable resolution, the camera's natural color response and
great exposure latitude as uncompressed and unprocessed sensor data.
ARRIRAW images have only one channel. A color reconstruction
algorithm calculates the missing components of each pixel based on
the type and position of the array of colored filters (Bayer pattern) on
the camera sensor.
ARRIRAW de-bayering is available through the ARRIRAW SDK or
custom processing, which is implemented in most of the major post
production tools for dailies processing and mastering.
The ALEXA sensor provides a horizontal resolution of 2.8K photo cells,
from which downsampling routines produce optimized HD and 2K
resolution images. For VFX, the images often are processed using the
native sensor pixel count and then downscaled to 2K, for example, at a
later stage. Using this approach takes advantage of the luminance
resolution, which correlates to the sensor pixel count. Furthermore, it is
possible to upsample ARRIRAW images to 4K. This works well because
of ALEXA's excellent image quality.
To Next Page
Loading...
