Lumagen VisionProHDP - Manual (Page 34)

VisionPro HDP
™ User Manual and Installer Guide
© 2004-2006 Lumagen®, Inc. 31 Rev 1.1
Selecting the Output Resolution
The Society for Motion Picture and Television Engineers (SMPTE) standards for 480p,
720p, 1080i and 1080p are used as reference points for output timing. Other resolutions
and vertical-refresh-rates are derived from these standards.
It is important that the optimal output resolution is selected. For DVI-D output, such as
for plasma, DLP, and LCD displays, the output resolution should be the native resolution
of the display. To find the native resolution of the display, check the user manual
provided with the display and use the instructions in the Installation Commands section
to select the appropriate resolution.
For CRT projectors, and other analog interface displays, the resolution must be selected.
For CRT projectors and RPTVs the best choice is more involved, depends on tube size,
focus, phosphor spot size, and video-bandwidth. For CRT projectors, some suggested
starting points, based on tube size, are 720p for 7 inch, 840p for 8 inch, and 960p for 9
inch. Use the instructions in the Installation Commands section to select the appropriate
resolution.
High-definition direct-view and rear-projection televisions typically support 480p and
1080i. Some also support 540p or 720p. If 720p is supported, it is the recommended
resolution, because 1080i suffers from display interlace-artifacts that reduce the
perceived vertical resolution to roughly the same as 720p provides. Since the output is
over-sampled horizontally, 720p provides nearly equivalent perceived vertical and
horizontal resolution as 1080i, and it eliminates interlaced-display artifacts.
A vertical-refresh-rate of 59.94-Hertz works well for NTSC, and PAL M, material. For
PAL (except PAL M) and SECAM, 50-Hertz generally provides the best picture. Note
that the selected rate must be supported by the display at the selected vertical resolution.
Note:
The maximum resolution depends on the vertical rate, the output aspect
ratio, and on whether the output size is reduced from factory defaults.
The software attempts to prevent illegal combinations of resolution, vertical rate and
aspect ratio, but given that there are millions of combinations, not all cases could be
checked.