Silicon Imaging SI-2K User Manual page 50

Right-clicking on any of the color-adjustment widgets activates a „virtual track-
ball" mode. This allows the user to move the mouse around like a trackball
control for fine increments of the image. This is especially effective with the
color-hue wheels in CONTROL SET 1. To exit the virtual trackball mode, right-
click a second time.
Clicking on the histogram indicator swaps between a live histogram and a
vectorscope. An important note about the histogram and vectorscope in the
IRIDAS control panel is that unlike the indicators in the main GUI, these IRI-
DAS-specific indicators reflect the values of the look applied to the RAW im-
age data, not the underlying RAW values like the main GUI indicators. This is
because the main GUI indicators are ideally suited for measuring the exposure
of the RAW image data, where-as the histogram and vectorscope in the IRI-
DAS control panel allows the user see how their color-correction is affecting
the final image. Clipping that happens during exposure is unrecoverable, hence
the indicators in the main GUI cover the RAW data only. If the RAW data is not
clipped, then clipping from the .look file can be recovered in post. Therefore for
the main GUI it is vital that the user have live information on the exposure level
of the RAW data and not the effects of the .look file which can be misleading
for actual exposure-level of the RAW image data.
The general workflow the IRIDAS color correction mode is that a user loads a
pre-existing .look file (typically the current .look file) into the LOOK LIBRARY,
and then modifies it using the MODIFY button associated with that look. Alter-
natively the IRIDAS control panel can be opened by clicking on the top-middle
hot-spot, at which point it will modify the current .look.
The control panel uses the current .look XML to set the color-correction con-
trols as an initial base for starting a color-correction from. So for instance, if
the gamma and color-gain operations were modified in the .look XML, the initial
screen when loading the IRIDAS control panel would reflect those changes to
those controls in the interface color-wheels and sliders.
When the user has completed a color-correction, it is very important to first
press the SAVE button in order to save-out a new .look file. Then the user can
press the DONE button and see their new .look in the main GUI and replaced
in the LOOK LIBRARY slot. At this time it is also copied into the main proj-
ect directory for access in post-production. Simply pressing the DONE but-
ton cancels the current correction and exits the IRIDAS control panel with no
modification to the .look file.
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LookControl
 SI 2K Manual