Grass Valley Imagestore 750 v.3.0.1 - Manual (Page 55)

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Imagestore 750
User Manual
system. When the Easytext option is not enabled, a special template name temperature.oxa is
reserved for displaying the special temperature probe datasources. This is the only Easytext file
that can be displayed on such a system.
After an Easytext template has been generated containing one or more of the temperature
probe datasource names, you can load it into a keying layer, and cut up, to display the tempera-
ture on-air.
Keying Parameters
You can configure the following keying parameters for both internal and external graphics.
• Source
The key source (actually the keying method) may be chosen from the following:
• Clip, gain and transparency
After the key source is selected, the key signal is processed with clip, gain, and transparency
to alter the mapping from key input luminance to key output values. Transparency modifies
the maximum key value as follows:
Fig. 4-5: Keying Parameters - Clip, Gain, Transparency
• Type
After the key output is generated, the type controls the combining of the background and
fill video signals. The Imagestore 750 supports both linear and full keying types.
Temperature Probe Datasource Name Displays Accuracy
TEMPERATURE_CELSIUS Celsius Rounds to nearest integer
TEMPERATURE_CELSIUS_TENTHS Celsius Rounds to one decimal place
TEMPERATURE_FAHRENHEIT Fahrenheit Rounds to nearest integer
TEMPERATURE_FAHRENHEIT_TENTHS Fahrenheit Rounds to one decimal place
Table 4-9: Temperature Probe Easytext Template files
Separate Key The key values are derived from the luminance content (Y value) of the
separate key.
Self Key The key values are derived from the luminance content (Y value) of the fill
signal itself.
None The key for an image is set to white so that there is no image transparency.
1023
Key Luminance (In)
Key
Value (Out)
1.0 (max)
0.0 (min)
Clip (= 64) Gain (= 940)
Transparency / 512