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© 2000 - INLINE, INC. IN1700 Operation Manual - Preliminary 06/23/00
Color - Computer video systems maintain separate video signals for red, green and blue, allowing
for more accurate color reproduction than conventional video monitors which combine all the
color information into one signal. In addition to less accurate color, there is generally a narrower
choice of colors available with conventional video monitors. Therefore, some colors shown on a
computer monitor simply cannot be reproduced on a conventional video screen, especially when
sent as a composite video or S-Video signal.
Scan Methods - The other big difference between the two video systems is the way the picture is
scanned on the screen. A high-resolution video signal is usually non-interlaced. This method
(also called progressive scan) “paints” all of the lines in a single pass from the top to the bottom
of the screen. A conventional TV video monitor displays an interlaced video signal. This means
that all the odd numbered lines are displayed first, followed by all the even numbered lines. The
two pictures, made up of odd lines and even lines, are displayed so quickly in succession that the
human eye combines the two into a single picture.
When the non-interlaced computer video signal is converted to an interlaced signal and displayed
on a conventional TV monitor / projector, flicker may be observed, especially on parts of the
image made of very thin lines (one pixel) or patterns composed of thin lines.
15 TIPS FOR HAPPY SCAN CONVERSION
Preview the Scan Converted Image - The best way to ensure a good scan converted image on a
conventional video screen is to connect your computer to the IN1700 and view the image
displayed on the conventional video monitor before you begin your presentation. This will let
you select the colors that look best on the video screen, determine the appropriate text size and
help you stay within the “safe title area.”
Choose Colors and Backgrounds Carefully - You may notice that intense colors and many
shades of red often look bad on the conventional video monitor, while pastel shades, greens and
grays provide a more pleasing image. Solid backgrounds are usually better than gradations and
patterns. If you are creating an on-screen presentation to be viewed through the scan converter,
select a color scheme and background that provides the best contrast and readability. Most
presentation packages offer several templates that define background hues, and the colors of
headlines and bullet types.
Before demonstrating software programs, view the scan-converted image to select color settings
that look best on the TV monitor. The Windows and Macintosh operating systems let you choose
the overall color scheme that sets the color of window borders, title bars, menu text and small
items. Remember that some viewers may be located far from your video display, so you must
select the best colors in order to enhance their ability to see illustrations, icons and other detailed
information.
Use
BIG
Fonts - You may enhance the readability of your presentation by using the largest
font size possible. Headlines should be at least 36 points, bullet points at least 24, and body text
no smaller that 18. For best visibility on speaker-support slides, try to limit yourself to no more
than five or six lines of text and no more that 25 words per screen.
When demonstrating software you may increase visibility by selecting a sans serif font such as
Arial
or
Helvetica
for menu bars and increase the font to a larger size. If there are parts of the
