Calibre UK LEDView 530 Operating Instructions Manual - page 23
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The output frame rate can also manually set to 24Hz, 48Hz, 50Hz or 60Hz if possible, i.e. such output
modes are available. Only 720p and 1080p output modes are available with 24Hz refresh rate. 480i
and 480p output modes are only available at 60Hz refresh rate. For all other modes 48Hz, 50Hz and
60Hz refresh rate is available.
3.5.5.
I/O Lock
Settings: On, Video, External
If I/O Lock is switched off the output is run with a fixed refresh rate determined by the frame rate
setting, which deviates from the input refresh rate, even if both are nominally at the same rate. This
causes occasional frame dropping or repeat. If I/O Lock is on the output refresh rate is following the
input refresh rate (Video) or to the vertical sync of an externally provided signal (External) . This is
achieved by modulating the output clock and works if input and output refresh rate are nominally at the
same rate, e.g. when frame rate is set to 60Hz and the video input is also 60Hz. If e.g. the video input
rate is 50 Hz and the Frame rate is set to 60Hz, the output is in free run mode. The status line of the
OSD window under Sync Mode indicates if the output signal is locked to the input signal (I/O Locked)
or in free run mode (Free Run) .
3.5.6.
Native Color Temp
Settings: 5500, 6500, 7500, 9300, 10000
Native Color Temp allows the user to select from pre-configured color temperatures to match the
display. If both Native Color Temp set here in the Output menu and Color Temp set in the Color menu
are set to the same value, no conversion is performed.
3.5.7.
Output Gamma
Settings: 1.0 to 3.0 in steps of 0.1
Output gamma allows to re-gamma video signals with pre-configured gamma values to match the
display. Input gamma and output gamma both default to 2.2. If they are both set to the same value,
there is no effect on the image.
Note: If e.g. an adjustment to reduce the level of red in the image is required, select a higher number
for the (input) Color Temp in the Color menu, or a lower number for the Native Color Temp in the
Output menu.
3.5.8.
Black Crush
Settings: 0 to 255 in steps 1
Black Crush provides a coring function on the output stage of the LEDView-400. This allows low-level
noise in dark areas to be clamped to black which can be useful on LED screens on which black level
noise can be particularly noticeable. It modifies the black response of the gamma & colour curves so
as to hide any black-level noise which may be apparent on the LED screen when high LED brightness
is used, but does this without reducing peak white brightness, unlike when black level is adjusted.
It is recommended to use a setting between 0 and 16 and not more than 20. For most LED screens the
optimum setting for Black Crush is between 8 and 20. For particularly noisy subject material 24 can be
used but detail loss may occur in dark areas. If too high a setting is chosen, image solarization may be
observed where dark image areas turn completely black or even change colour.
The input black level should have been optimized first prior to using Black Crush and the TNR (and
where applicable MPEG) noise reduction filter settings should be optimized first. It is not a
replacement for correct input settings but is available to clean up any remaining black level noise on
the signal which may become apparent on very bright LED screens.