16
Luminance Adjustment (HISTOGRAM)
1.
Under the same on set lighting conditions aim the camera back
to the white background or ideally a grayscale reference chart
which includes 100% white and absolute black.
2.
Select HISTOGRAM mode on the VS-100 using the NEXT
MODE option.
3.
Adjust the camera’s IRIS and Neutral Density Filter to reach the
desired maximum white level state. If the camera has a Zebra
function you can use this to identify areas of under or over
exposure too.
4.
If aiming at a precise grayscale chart, the VS-100 histogram
output may resemble evenly spaced vertical sample bars in line
with the grayscale chart. However, if the pattern is distributed
towards the right (100), it can mean the camera is over exposed.
If the pattern is distributed towards the left (0), it can mean the
camera is under exposed.
5.
If there are readings below zero the black levels will be crushed
or too black. Use the master pedestal setting on the camera to
set the lowest black level at or slightly above 0.
6.
Once the first camera is correctly calibrated select TOOLS>
TRACE MEMORY> SAVE TRACE to save the calibrated matrix
levels from the first camera.
7.
Now connect VS-100 to the second camera on the set. Adjust
the white and black balance on the next camera as described
earlier.
8.
Now adjust the grayscale reading from second camera output so
that it matches the saved output from first camera to align the
cameras. The same procedure can be repeated for any
remaining cameras.
Содержание VS-100
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