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| Fig. 24 |
The colour temperature is constant on the vertical lines, but is more or less different from the black body curve. This means that the higher points of the graph are more green. On the contrary, the lower points of the graphic yield a more purple
image.
Gamma Correction
Determines the system’s response to the grey scale, empha- sising or attenuating the different grades of brightness (blacks, dark, medium, light grey, whites) in the projected image.
The projector has a range of gamma functions which enable you to display any image to the best effect for the type of video source, the ambient lighting and your subjective pre- ferences.
There are 4 sets of gamma curves: Standard (ST), Enhanced SIM2 (EN) and Graphics (GR), User. The Standard curve has been defined for general use, and is set for videocameras, digital cameras, and for viewing films or photos on your PC. The Enhanced set is suitable for watching movies. The Graphics set is suited to displaying synthetic graphics (PC, CAD, PC presenta- tions, etc.). User enables you to define your own curve. You can thus select the coefficient which determines the curve.
Table 5 - Gamma correction settings
functions | Standard |
| ST1 | For general use |
| ST3 |
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Gamma |
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| ST2 |
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| ST4 |
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| ST5 |
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functionsGamma | SIM2Enhanced |
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| meras, digital cameras or TV studios in low |
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| EN1 | Suited to displaying images from videoca- |
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| meras, digital cameras or TV studios in high |
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| ambient light. |
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| EN2 | Suited to displaying images from videoca- |
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| ambient light. |
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| EN3 | Suited to displaying cinematographic material |
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| in high ambient. |
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| EN4 | Suited to displaying cinematographic material |
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| in moderate ambient. |
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| EN5 | Suited to displaying cinematographic material |
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| in controlled ambient light. |
| Graphics |
| G1 | Suited to displaying graphic images (e.g. Win- |
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| dows desktop) in moderate ambient light. |
Gamma functions |
| G2 | Suited to displaying graphic images in mode- | |
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| rate controlled light. |
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18