2017

Table Of Contents
To generate:Select:
Proxies during captureProxy on Capture
Generating proxy during capture is the quickest method. Depending on hardware configuration of your
system, capture may be performed in real time with playback. Some extra required processing, however,
may prevent the graphics board from updating the image window and broadcast monitor in real time, so
you may not be able to view the clip being played as it is captured.
Monitor box Set this to Monitor VTR or Monitor Output. In Monitor VTR mode, the signal coming back
from the VTR is displayed, and video may be appear to be late compared to the audio. In Monitor Output
mode, the signal being output to tape is displayed, and the video and audio should be in sync.
Dual Image Resizing Filter box Select the resize algorithm used to scale back to full resolution clips captured
using the Dual Image - Scale resolution. Ordered from lowest quality (Triangle) to highest (Lanczos). On
some lower-end workstation, you might need to select a lower quality algorithm to capture every frame.
Inputting and Outputting with Headroom
NOTE Headroom in input, output, and preview, is not supported by Blackmagic Design devices, only by AJA ones.
This means that video going through the BMD device always has luminance in legal range.
With 4:2:2 serial digital interface (SDI) input and output connections, the colour components of video
signals are Y (luma), Cb (blue colour difference), and Cr (red colour difference). For standard video signals
in 10 bits, black has a luma value of 64 and white has a luma value of 940. When performing standard
captures to RGB values on Smoke systems, black YCbCr (64,512,512) maps to RGB (0,0,0) and white YCbCr
(940,512,512) maps to RGB (1023,1023,1023). SDI values 0 to 3 and 1020 to 1023 are reserved values for
synchronization purposes.
Some cameras record shadow details below the video luma black value of 64 and white detail above the
video luma white value of 940. These details are called super blacks and super whites. These are also referred
to as headroom and footroom. Under normal circumstances, headroom is not converted during capture,
and the super black and super white details are lost, as described in the following illustration:
Clip Input/Output Using a VTR | 277