Configuring the Gefen Converter
As noted earlier, the HP DreamColor LP2480zx is capable of very closely matching the appearance
of standard studio reference monitors, including the CRT-based products which are still common in the
industry. But in order to achieve this performance level the video signal must be fed through a signal
converter so that what reaches the monitor is an RGB progressive signal. If your editing system or
video equipment outputs an RGB true progressive signal via HDMI, you can connect it directly to the
HP DreamColor LP2480zx and it the signal will be displayed correctly. Otherwise you will need to
use a converter, such as the Gefen HD-SDI to HDMI converter, to attain the best result.
Gefen produces both an HD-SDI to HDMI and an HD-SDI to DVI converter. We strongly recommend
the HDMI converter as it will output a 10-bit signal to the HP DreamColor 2480zx monitor. (DVI
connections do not support 10-bit signals and, as a result, the HD-SDI to DVI converter will always
output an 8-bit signal.) The Gefen box will accept either a single-link or a dual-link HD-SDI or SDI
signal. See the Gefen manual, if necessary, to assist you with the proper cabling of your HD-SDI
source and the HDMI output.
The Gefen HD-SDI to HDMI converter is configured via an on-screen display (OSD). You should set
your HP DreamColor LP2480zx monitor to the HDMI input to display the Gefen signal. (It is not
necessary to have an HD-SDI source connected to the Gefen box when you configure it, but it is
recommended.) In order to properly configure you need to make adjustments to the Picture, Input, and
Output options. You must use the supplied remote control to access the OSD. Press the MENU button
on the remote to overlay the OSD over the video signal.
Configuring the Picture Options
There are three options within the Picture group that should be checked and adjusted, if necessary.
Black Level — should be set to 0 (zero)
Values greater than zero will result in the blacks being grayer than desired.
Gamma — should be set to Default
This option will instruct the Gefen converter to use either the Rec.709 or Rec.601 gamma, as
required by the output signal.
Color Range — should be set to 16–235
This will output the blacker-than-black and whiter-than-white portions to the monitor. Setting this to
0–255 will result in these values being clipped. Though this can increase the total available
contrast, it is important—especially if you are doing color grading—that the whiter-than-white
portions of the signal be displayed on the monitor. Otherwise you do not know whether any
clipping of specular highlights and white texturing (such as those in clouds) was clipped in the
source or by the Gefen. (As a rule it is never a good idea to grade a shot with any downstream
In addition to these three options, you may want to experiment with the Motion Threshold setting.
This setting controls the de-interlacing circuitry. Though we've found that the default setting of 4 works
well for most interlaced footage with the latest version of the Gefen firmware (as of the publication of
this white paper), depending on the firmware installed in your Gefen box you may need to try a
different value to eliminate any visible interlace tearing.
Configuring the Input Options
There are two options within the Input group that should be checked and adjusted, if necessary.
Input Format — should be set to Auto Detect
In rare instances it may be necessary to manually select the correct input format with certain HD-SDI
equipment, but as a rule leaving it set to Auto Detect is the best choice.
Using the HP DreamColor LP2480zx for professional video applications