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Reference Manual ATOM one SSM500
Since the global white balance is done before storing the video data (see chapter 2.1), the
recorded video data is already white balanced. Therefore the white balance gains of the
playback chain will internally be set to x1 when playback is started. This ensures that the
playback has the same look as the original live video.
To show the correct white balance gains that were used during recording, the camera
stores the white balance R/G/B gains when the recording is started and will display those
when the buffer is being played back (although internally a gain of x1 is used).
You can change the white balance of the live chain during the recording, or use the AWB
and those changes do have an immediate effect on the recording, but they will not be
stored in the buffer meta data. That means when playback is started, the camera will
report the initial values of the R/G/B gains. Any updates made later will not be reflected in
the values reported by the
gain_red / gain_green / gain_blue
commands.
If you are not satisfied with the white balance or color calibration during playback, you can
select a different preset using the
wb_preset
command or change the white balance gains
(
gain_red / gain_green / gain_blue
commands) while the playback is running. These
settings are only temporary and will be reset to the values stored in the buffer meta data if
you stop/restart playback or play back a different buffer.
2.1.2.1
Workflow A: Independent Live and Playback Chains
As described in chapter 2.1 the live and playback chains feature their own image
processor. By default these are configured in a split configuration, that means they can
configured independently.
The image engineer can use this to perform all changes on the live chain (by setting the
out
command to 1). His changes will not effect the playback output which might be on air
at the same time.
Once the setup is complete and the playback output is not on air anymore the
copy_settings
command is used to copy all settings form the live to the playback chain to
apply the new look for the next playout.
If corrections have to be made to the playback output without wanting to change the live
output the playback chain is selected by setting the
out
command to 2. Please note that
there is no command to copy settings from the playback to the live chain.
2.1.2.2
Workflow B: Linked Live and Playback Chains:
If the above workflow is not desired or to complicated, both chains can be linked by using
the
link_settings
command. If
link_settings
is enabled both chains will be configured at
the same time, regardless of the current setting of the
out
command.
One important exception are the
gain_red / gain_green / gain_blue
commands used to
setup the white balance: Since the global white balance is done before the recording, the
recorded image data is already white balanced. Therefore changing the white balance of
the live chain will not change the white balance of a recording that is currently being
played back, even when both chains are linked. If you want to fine-tune the white balance
of an existing recording, you have to switch to the playback chain using the
out
command
before sending the
gain_red / gain_green / gain_blue
commands.
