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| | | | | GammaComp adjusts the display monitor's internal 10-bit gamma Look-Up-Table, allowing various custom display gamma or Tone-Response-Curves to be achieved. Because the gamma compensation is done internally to the display at 10-bit resolution, the drawbacks of using the 8-bit Look-Up-Tables in the video graphics adapter can be eliminated. The 10-bit resolution provides 4 times as many levels as 8-bit, so color banding problems that occur when using 8-bit tables can be reduced.
GammaComp uses a two way communications link with the display monitor via the video graphics adapter and normal video cable. No extra cables are necessary. Special support is required in the video graphics display driver in order to provide this functionality.
This communications link is called DDC/CI (Display Data Channel - Command Interface) and is an industry standard developed by VESA (Video Electronics Standards Association)
| | | | Confirm that the Video Graphics Card supports DDC/CI (see Supported Video Drivers) and install the GammaComp software. This will install the GammComp software and drivers.
Note: You may receive a warning message that the device drivers being installed are not digitally signed by Microsoft - This is normal and it is OK to proceed with the installation.
GammaComp is accessed from: Start > Programs > NEC DISPLAY SOLUTIONS > GammaComp.
The GammaComp application allows different methods of adjusting the monitor gamma curve:
- Monitor Native Gamma - This sets the gamma of the monitor to it's Native value. This is approximately a 2.2 gamma.
- Gamma Curve - This allows the gamma curve to be adjusted by numerical value using a slider control. The gamma can be adjusted to values between 0.5 and 4.5.
- Custom Curve - The gamma curve can be adjusted to a custom shape using control points. Between 1 and 8 control points per color can be used to adjust the curve.
- S-Curve - The gray areas of images will look much brighter than the “Monitor Native Gamma” setting.
- DICOM - This curve approximates the DICOM standard used in medical imaging.
- Edit Custom Curve - The gamma table can be directly modified by editing the values for the LUT (Look Up Table) entries for each of the Red, Green and Blue curves. Double-click on a table entry to modify the data.
Saving and Opening Gamma Table data - The current Gamma Table data (LUT settings) can be saved to, or read from a Comma Separated File (CSV) file format. From the File menu, select "Open Gamma Table File..." to load previously saved Gamma Table data from a file. Select "Save Gamma Table File" to save the current settings to a file.
Important note: Changes to the monitor gamma are not done in real-time and the changes will only be visible after the monitor is updated with the new gamma Look-Up-Table. After the gamma has been adjusted, click the "Update Monitor Settings" button to update the monitor. The new gamma setting will then be visible.
Additional Operation Information
- “Gamma Curve” with "Link Colors" is the same as “CUSTOM” in Advanced menu Tag 5 on the monitor's On Screen Display.
- Edit Custom Curve data range:
The range of the Gamma Table data (LUT settings) that can be manually entered using the "Edit Custom Curve" function and read from a CSV file is as follows:
256(0 to 255) Entry Models:
0 to 1020 for the following models:
- NEC LCD1980SX
- Mitsubishi DiamondPoint SX98LCD
0 to 65535 for the following models:
- NEC LCD1980FXi
- NEC LCD1980SXi
- NEC LCD1980SX+
- NEC LCD2180UX
- Mitsubishi DiamondPoint UX21LCD
- Mitsubishi RDT191H
- Mitsubishi RDT211H
1024(0 to 1023) Entry Models:
0 to 65535 for the following models:
- NEC LCD1990SXi
- NEC LCD1990SXp
- NEC LCD2090UXi
- NEC LCD2190UXi
- NEC LCD2190UXp
- NEC LCD2490WUXi
- NEC LCD2690WUXi
- NEC M40
- NEC M46
The current Gamma Table data (LUT settings) can be saved to, or read from a Comma Separated File (CSV) file format. The format of the file is as follows:
256(0 to 255) Entry Models:
[model name]
red0, red1,......,red255
green0, green1,......green255
blue0, blue1,......blue255
1024(0 to 1023) Entry Models:
[model name]
red0, red1,......,red1023
green0, green1,......green1023
blue0, blue1,......blue1023
Where [model name] is the monitor model name as show in the main GammaComp window.
Hint: It is easiest to first save a CSV file using GammaComp and examine the formatting.
- OSD Operation (All models except NEC LCD1980SX and Mitsubishi DiamondPoint SX98LCD):
- “S-Curve” is the same as “OPTION 1” on the Advanced menu Tag 5 on the monitor's On Screen Display.
- “DICOM” is the same as “OPTION 2” on the Advanced menu Tag 5 on the monitor's On Screen Display.
The monitor can be reset manually, if necessary, by pushing the “EXIT” and the “SELECT” buttons at the same time while turning on the monitor using the Power (Vacation) switch.
Supported Video Graphics Card Drivers
Not all video graphics adapters and drivers support DDC/CI yet. You may have to obtain the latest video drivers directly from the manufacturer in order to use GammaComp. Please check the list of confirmed supported video graphics adapters on the NEC DISPLAY SOLUTIONS GammaComp support page.
Several video drivers included "in the box" with Windows XP support DDC/CI, however it is always best to check with the manufacturer if any newer updates are available.
No drivers included "in the box" with Windows 2000 support DDC/CI, so it is absolutely necessary to obtain updated drivers.
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