28 Chapter 2 Testing Video Displays
Computer display formats
Computer display formats are assumed to use progressive scanning. Computer format
names consist of four blocks. The initial three characters indicate the vendor ID using the
EISA ID (for example, IBM, SUN, and VSC) or the standard body or acronym (for example,
SMT, DMT, GTF, CEA, and EIA). The next two characters provide the first two digits of the
horizontal resolution in pixels. Following the horizontal resolution are two characters which
indicate the frame rate. The final character indicates the aperture, which is used only if the
aperture is not 1.33 (A). The following are examples of computer display formats:
• VSC1275 for Viewsonic 1280 by 1024 at 75 Hz
• DMT0685 for Discrete Monitor Timing with 680 by 480 at 85 Hz

Viewing format parameters

You can use the Format image or VGM to view detailed information about formats in the
generator.
To view formats parameters using VGM:
• Open each format in the Font Editor.
• Generate a detailed format listing.
Refer to the VGM online help for instructions.
Selecting images
Once you have determined the format or formats appropriate for testing the display you
will apply a series of images suitable for evaluating the display. Of primary importance is
determining what type of display you are testing (for example, CRT or digital flat panel
display). You must also determine if you are testing composite TV and use images
appropriate for these formats and video types.
Each image in the generator’s library is intended to test one or more attributes of a
particular display type and video type.
Note: You can create your own images. See “Creating custom images” on page 75 for
details. Additionally, you can create your own custom Image knob lists . See “Editing Im age
knob list” on page 81 for details.