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brightness information intact or boost its colour to give a more colourful (perhaps too
colourful) image.
RGBShadow
In addition to being able to set a black level for a given input it is also possible to set the
black level specifically for each of the primary colours in that input. These sliders, called RGB
Shadow, equate to a setting for the black level of each specific colour.
RGBHighlight
In addition to being able to set contrast for a given input it is possible to set a contrast (white
level) for each of the primary colours also. These parameters are called RGB Highlight.
Histograms
A useful tool offered by the Tessera processor is a selection of histograms. Histograms
depict distribution of pixels across the possible range of a colour or colours of the incoming
video feed in real time after they have been modified by the input colour controls. There are
six different histograms available:
l Luminance
l Red
l Green
l Blue
l Red, green and blue and luminance with separate histograms
l Red, green and blue luminosity with overlaid histograms
All histograms can be displayed linearly or logarithmically.
Their main use is to allow the user to identify and compensate for perceived deficiencies in
the incoming video feed. The user can then see how changes to the input colour controls
may be affecting the colour content of that feed. By adjusting those controls it may be
possible to boost the amount of colour depth of the displayed signal, resulting in a better
distribution of peaks in the histogram.
The X-Axis of each histogram is graded from 0% to 100% and shows a column to indicate how
much content there is at that percentage of the given colour. The Y-Axis showing the
amount of content at a particular percentage is auto-ranging in scale and adapts to fill the
axis.
The logarithmic scale will accentuate small columns so tiny areas of a particular colour can
be visualized in instances where one particular percentage dwarfs all others.
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