Lumagen Radiance Series Tech Tip

Radiance Tech Tip 18
Widescreen with Dual Projection Screens

Introduction

The Radiance can be used to simplify aspect ratio control for a system, which uses a 16:9
projector to display an image on dual projection screens. This installation has a fixed 16:9
screen on the wall and a 2.35 screen that is dropped in front of the fixed screen, to watch
2.35 movies. Because both screens are the same width and the 2.35 screen is closer to the
projector, the projected image is the correct width for the 2.35 screen, but the image is too
wide and spills over the edges of the 16:9 screen.
The projector is left in its default 16:9 mode and at a fixed zoom setting. The user memory
buttons on the Lumagen remote are used to control the size of the projected image. Press
user memory button "MemA" to shrink the image to fit the 16:9 screen. Press user memory
button "MemB" to display a full width image on the 2.35 screen.

Using User Memory Buttons to Control Image Size

The zoom setting on a 16:9 projector is adjusted so that the image fills the width of the 2.35
screen. The projected image spills over the top, bottom and sides of the 16:9 screen. The
projector zoom is fixed at this setting. If you are using a 1080p projector, 1080p 2.35
letterboxed video sources are not scaled. i.e. When you play a Bluray 2.35 movie, the
Radiance scalier is turned off and the image is displayed at a 1:1 ratio. The 4:3 and 16:9
images are scaled down to fit inside the height and width and height of the 16:9 screen.
4:3
Figure 1, 16:9 projector with fixed zoom used on a 2.35 screen
4:3 On the Lumagen remote press "MemA", "4:3". The projected image spills
over the top, bottom and sides of the screen and the Radiance shrinks
the active image to fit the screen. Black bars are added on both sides of
the screen by the Radiance.
16:9 On the Lumagen remote press "MemA", "16:9" The projected image
spills over the top, bottom and sides of the screen and the Radiance
shrinks the active image to fit the screen.
2.35 On the Lumagen remote press "MemB", "2.35". The image fills the width
of the screen
© 2013 Lumagen, Inc.
16:9
1 Radiance Tech Tip 18, Rev 1.0
2.35