Christie M-Series User Manual page 70

Section 3: Operation
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.
• 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.
• CLOSE SPEED:
The close 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 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 amount of detail reduction
depends on the average level of brightness in the scene, and the setting of this control. The brighter the scene
the less impact this control will have. It is often best to adjust the sensitivity and white compression together to
find the optimal settings.
• COPY FROM:
This control allows you to copy the Dynamic Iris Settings from an existing profile to the current profile.
3-30 M-Series User Manual
020-100009-02 Rev. 1 (04-2009)