NEC SpectraView II Guia Del Usuario página 17

16 | NEC SPECTRAVIEW II - USER'S GUIDE
Gamma Curve
Gamma Curve selects the desired tone response curve of the calibrated display. Options are:
• Monitor Native Gamma - No correction is applied and the display's Look Up Tables are set to linear.
• Gamma Curve Value - The response curve will follow a simple gamma curve. Values between 1.0 and 3.0
can be entered. A gamma value of 2.2 is the most popular for most applications.
• DICOM Curve - The response curve follows the DICOM (Digital Imaging and Communications in Medicine)
specification. This response curve is aimed at medical use, however it can be used for other applications. The
goal of the DICOM response curve is to have a visually linear display response.
Use Scale Factor - The DICOM response curve shape is based on the measured black level and Intensity. If
the black level or Intensity of the display changes, then the shape of the DICOM response curve also changes.
If a display is not expected to be re-calibrated for a period of several months, this feature can be used to
increase the longevity of the DICOM calibration using the knowledge that the displays brightness will decrease
slightly as it ages. By scaling the black level and Intensity values used to calculate the DICOM response
curve, using the Use Scale Factor value, the response curve can be based on the lower future black level and
Intensity. The value used will depend on the display, its usage, and the time interval until it is expected to next
be re-calibrated.
• BT.1886 - A response curve recommended for flat panel displays used in HDTV studio production. It
approximates a gamma of 2.4 but automatically adjusts to improve detail based on the black level.
• Custom Curve - Advanced and custom response curves can be selected from presets or created by
importing a table of values. Click the Edit... button to open the Custom Gamma Curve dialog.
Intensity
The Intensity selects the luminance or "brightness" of white for the calibration. Options are:
• Maximum possible - calibrates the display to the maximum possible luminance that it can achieve.
The actual value achieved will depend on the display's type, its age and the white point used. This is not
recommended when trying to exactly match two or more displays, since there may be a difference between what
Intensity each display can achieve.
• Specific Level - calibrates the display's Intensity to a specified target value. If the display can not achieve the
specified value, it will be calibrated to the closest possible Intensity, and a message will be displayed after the
calibration has completed.
Note:
If you are unsure about what level to use for the Specific Level for a particular application, it is possible to interactively
adjust both the White Point and Intensity using the Visual Match feature in the Custom White Point dialog.