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NCR RealScan 7802 Price Verifier User Guide
497-0425530 Release E
06/03
65 of 94
Appendix C – Creating a
Slideshow
This section contains detailed instructions for creating a slideshow file. The easiest way
to make a slideshow is to use a text editor such as Windows® Notepad to create the
script necessary to run the graphics images (slides).
A
slideshow
is a file containing graphic images and a script (the instructions) on how
these images are to be displayed. Slideshow files reside on the network in the servers’
share directory and are 'pushed' to the displays by commands in the slideshow file and
stored in the unit’s RAM memory. The slideshow is executed from within the unit.
A
slideshow
file consists of a sequential list of references to graphics images in the
order which they are displayed and the duration each image is displayed. The file uses
Token = Value pairs to define the sources of the image files. Blank lines, lines starting
with a single quote (') or an octothorpe (#) are ignored, as is white space around tokens
or the equal sign separating the token and its value.
Creating a Slideshow File
The
SLIDESHOW
section is a script that is interpreted by the RealScan 7802 as it is
executed. Slideshow entries consist of two items of information: the slide image by
sequence number and the duration the image is displayed in ticks where a tick = 1/100
second. A
FRAME
may be defined to equal a number of ticks; for example,
FRAME = 100 makes FRAME = 1 second. Frame can be shortened to F, which can then
be used as the duration (F1 = 1 second or F3 = 3 seconds)
Caution:
Do not display a fixed image for long periods of time, this may cause a
permanent latent (ghost) image on the LCD. The LCD warranty does not cover this
effect.
This effect known as “imaging sticking” is caused by an ion charge buildup in the liquid
crystal material and is inherent to all AMLCD displays. The LCD manufacturer
recommends no longer than 5 minutes before changing the image, the purpose being to
turn ‘off’ the pixels that are ‘on’ for a period of time. This prevents image sticking from
occurring.
Using Multiple Graphic Windows
Several graphic windows can be displayed on the screen simultaneously. Multiple
window displays are specified from the slideshow file. Each window can be
individually sized, positioned on the screen, and its display time and delay time to the
next window selected.
Images used during multiple window presentations must be sized prior to running
them in the slideshow file. It is also recommended that the same color palette be used
for each of the images as the last palette loaded affects all previous images (windows)
on the screen at that time. Images can be edited with any good commercial image-
editing program such as CorelDraw, Corel Designer, Corel Picture Publisher, or Adobe
Photoshop. A shareware program, ImageMagik, is provided on the CD-ROM. A full
screen image is 320 x 240 pixels thus image windows need to be smaller than this size
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