Christie Roadie HD+35K User Manual page 24

Section 2: Installation and Setup
Although image size and aspect ratio can be adjusted using projector software, it is still ideal to use a screen
with an aspect ratio that closely matches your likely source material. You can then more easily fill the screen
with the image without restricting either image size or content. For example, standard video from a VCR has a
4:3 ratio (approximately) and can fill a 4:3 screen without side-to-side stretching, whereas a high-definition
signal with a 16:9 aspect is largest on a 16:9 screen.
As shown in Figure
bars" on both sides of the image (if the screen is wider than the source material) or above and below the image
(if the source material is wider-typically called a letterbox display).
Alternatively, if the area of unused pixels is considered minimal, you may prefer to use the projector's software
control to slightly stretch the image either horizontally or vertically-enough to utilize the remaining pixels
while not noticeably distorting the image.
Using a Cinema "Flat" Screen (1.85 aspect ratio)
By default, source signals closely matching the projector's 2048 x 1080 display area will fill this area
accordingly. Signals with lower aspect ratios will automatically scale to be as large as possible while
maintaining their original aspect ratio. For details on resizing behavior, refer to
Menu.
2-8
Table 2.2 Typical Aspect Ratios
Application
SXGA
35mm filmstrip
NTSC Video/XGA
PAL Video/XGA
HDTV Video
Letterbox Video/"Flat"
Roadie Native Resolution
Cinemascope
Screen edge
Image edge
5:4 image
on
16:9 screen
Figure 2-7 Aspect Ratios: Image vs. Screens
2-7, an obvious mismatch between source material and screen is characterized by "black
Aspect Ratio
1.25 (5:4)
1.32 (4:3)
1.33 (4:3)
1.33 (4:3)
1.78 (16:9)
1.85 (2048 x 1080)
1.89 (2048 x 1080)
2.35
Screen edge
Image edge
16:9 image
on
5:4 screen
Section 3.6.3 Image Settings
Roadie HD+35K User Manual
020-100340-02 Rev. 1 (01-2010)