Page 10ULTRA★STEREO
PSA-200 Instruction Manual 2nd Edition. January, 2000
side the image and not in the darker bor-
der surrounding it in order for a manual
alignment border to work.
Artificial
Border
Screen
Edge
(Fig. 4) Manual Alignment
Measuring Luminance
First, use the Automatic or Manual Alignment
function. Next, press or click on F4, Lumi-
nance. The PSA-200 software breaks down the
luminance of the projection screen into 45 (9
X 5) zones (see Fig. 2). A separate luminance
value is measured and displayed for each
zone. Each of these luminance values is an
average of 10 separate measurements taken
at different places in that zone. The shading
of each zone shows the relative luminance
with respect to the other zones, giving a good
display of the light pattern for ease of lamp-
house adjustment. Zones are numbered, left
to right, starting from the top, for reference.
The status bar (located at the bottom of the
screen) displays the zone that the mouse
pointer is in, along with the average lumi-
nance and the center zone’s luminance.
Using the Spot Meter
The Spot Meter function is useful in taking
measurements of ambient light, reflected light
and lens flare. While in Camera View (F3) or
Luminance (F4), press or click on F6, Spot
Meter. Use the mouse to move to any part of
the area being analyzed and the luminance
value displays in the status bar at the bottom
of the screen, along with the center luminance
and the number of the zone the Spot Meter is
in (see Fig. 5).
OPERATION
This section describes the operation of the
PSA-200 in detail. It is organized by specific
activity for easy reference. These activities
appear in the usual order they are per-
formed when using the PSA-200.
Automatic Alignment
Manually adjust the camera angle and the
camera zoom switch so that the theater
screen appears centered in the camera’s
viewfinder (see Fig. 3). Press or click on F3,
Camera View. The image should appear cen-
tered in the laptop computer display. Ad-
just the zoom control so that the edges of
the screen are visible in the laptop com-
puter display. Now press or click on F2, Auto
Align. The PSA-200 software will automati-
cally sense the edges of the movie screen
image and create an artificial border for the
luminance measurements. This border is a
rectangle inset from the screen edges by 5%
of the screen dimensions. All screen lumi-
nance measurements are made within this
border. NOTE: The Camera View, Luminance
and Spot Meter are the only functions that
use the alignment border.
Manual Alignment
In rare instances, when the lamphouse is
severely misaligned, the automatic align-
ment software will not be able to locate the
screen edges. In this case, the manual align-
ment function must be selected. This func-
tion allows the user to manually set the
borders of the screen area to be analyzed.
First, press or click on F3, “Camera View,”
then click on the “Alignment” menu, then
on “Manual.” Position the mouse pointer on
the top-left corner of the desired area, then
click and drag the mouse pointer to the
bottom-right corner of the area and click
again. The manual alignment border and the
previous alignment border will both remain
on the screen. Now select “Camera View”
again. A single alignment border, represent-
ing the manual alignment, should be present
on the screen (see Fig. 4). The manual align-
ment border that is produced must lie in-
