Christie Christie HD User Manual Page 81

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Section 3: Operation
M Series User Manual 3-31
020-100009-08 Rev. 1 (05-2013)
3.6.12Dynamic Iris
The Dynamic Iris adjusts the aperture to allow more or less light through. This will allow for deeper blacks in
dark scenes.
NOTE: Dynamic Iris is only applicable on 200W and 350W models.
Enabled: Enable either Manual or Per Channel operation of the Dynamic Iris. If set to Manual, set the
Dynamic Iris Position control to set the Dynamic Iris to a fixed position, as a percentage of fully open. If set
to Off, the position of the Dynamic Iris will be fixed at fully open. If set to Per Channel, the Dynamic Iris
will operate as selected by the current channel, which may be Off, Manual or Dynamic. This control is a
global setting. All other Dynamic Iris controls are applied to channels.
NOTES 1) Dynamic Iris should not be used on blends, as this could result in image distortion. 2) Dynamic
mode is only permitted in Dual lamp mode. If the global setting is set to Per Channel while in Dual lamp
mode, then switching to Single Lamp Mode will ignore the channel settings, grey out the Per Channel option
and set the Dynamic Iris to 100% open. If the Dynamic Iris mode is not changed, then when switching back
to Dual Lamp mode, the Dynamic Iris setting will return to Per Channel. If the Dynamic Iris mode is
changed, then when switching back to Dual Lamp mode, the Dynamic Iris setting will remain at the current
setting. The user will have to specifically go and set it back to Per Channel.
Dynamic Iris Position: Set the fixed manual Dynamic Iris position as a percentage of fully open.
Mode: Set the Dynamic Iris Mode for the current channel.
Off will place the Dynamic Iris in a fully open position.
Manual mode allows the user to adjust the level of light to statically increase the black levels.
Dynamic mode allows the Dynamic Iris to open/close based on the frame content and Dynamic Iris Set-
tings control. This will produce optimal black levels.
NOTE: On DLV projector models, the Dynamic mode of the Dynamic Iris is not available. In Constant
Intensity mode, Dynamic Iris control is disabled in the menus. In Constant Power mode, only manual
Dynamic Iris control is available.
Dynamic Iris Settings: There are 3 predefined settings:
Dark Scenes, which produces high contrast ratios, is for movies primarily consisting of dark content.
Medium Scenes is for video content containing a moderate level of dark scenes.
Light Scenes is for movies containing only a few dark scenes. The 4 User settings allow you to fine tune
the Dynamic Iris and save your own settings.
Sensitivity: Adjusts how sensitive the Dynamic Iris control algorithm is to small bright objects entering and
leaving an image, such as stars or candles. With a lower sensitivity value these small bright objects are more
likely to be ignored, producing a more stable light level for the image, with the side effect that some detail in
those bright objects will be lost. It is often best to adjust the sensitivity and white compression together to
find the optimal settings.
Open Speed: The open speed of the Dynamic Iris represents the maximum Dynamic Iris change per frame.
Increasing this value will allow the Dynamic Iris to travel further in a frame. Decreasing this value will allow
for a more gradual change. A slower value will reduce any flicker in the image, but it will also mean that the
Dynamic Iris will not react quickly to a scene that suddenly becomes much brighter; resulting in a image that
will show a significant loss of detail for several frames.
Close Speed: The close speed of the Dynamic Iris represents the maximum Dynamic Iris change per frame.
Increasing this value will allow the Dynamic Iris to travel further in a frame. Decreasing this value will allow
for a more gradual change. A slower value will reduce any flicker in the image, but it will also mean that the
Dynamic Iris will not react quickly to a scene that suddenly becomes much darker, resulting in an image that
does not have as much contrast as it could for several frames.
White Compression: The level of white compression adjusts amount of detail in bright parts of dark scenes.
It does not eliminate the detail in affected areas (as the sensitivity control does) but merely reduces it. The
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