Christie M Series User Manual page 74

DYNAMIC IRIS
The Dynamic Iris adjusts the aperture to allow more or less light through. This will allow for deeper blacks in
dark scenes.
• ENABLED
Enable either Manual or Per Channel operation of the Dynamic Iris. If set to Manual, set the Iris Position
control to set the iris to a fixed position, as a percentage of fully open. If set to Off, the position of the iris will
be fixed at fully open. If set to Per Channel, the 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 mode is only permitted in Dual lamp mode. If the global setting is set to "Per Channel" while in
2)
Dual lamp mode, then switching to Single Lamp Mode will ignore the channel settings and will grey out the
"Per Channel" option and set the iris to 100% open. If the Dynamic Iris mode is not changed, then when
switching back to Dual Lamp mode, the iris setting will return to "Per Channel". If the Dynamic Iris mode is
changed, then when switching back to Dual Lamp mode, the iris setting will remain at the current setting. The
user will have to specifically go and set it back to "Per Channel".
• IRIS POSITION
Set the fixed manual iris position as a percentage of fully open.
• MODE
Set the Dynamic Iris Mode for the current channel. Off will place the 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 iris to open/close based on the frame content and Dynamic Iris Settings control. This will produce optimal
black levels.
NOTE:
Intensity mode, iris control is disabled on the menus. In Constant Power mode, only manual 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, i.e. thriller or horror scenes. 'Medium Scenes' is for video content containing a
moderate level of dark scenes, i.e. action movie. 'Light Scenes' is for movies containing only a few dark
scenes, i.e. animation or a PC source. The 4 User settings allow you to fine tune the dynamic iris and save your
own settings.
• SENSITIVITY
Adjusts how sensitive the 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 iris represents the maximum iris change per frame. Increasing this value will allow the
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 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.
M Series User Manual
020-100009-04 Rev. 1 (10-2009)
Dynamic iris should not be used on blends, as this could result in image distortion.
On DLV projector models, the Dynamic mode of the iris is not available. In Constant
Section 3: Operation
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