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The most difficult thing to judge when
shopping for a TV is how good the picture
looks. Good is a subjective term, so relying on
the judgment of reviewers (such as CNET)
may not get you exactly what you want. Then
again, many reviewers scoff at the kinds of
pictures that impress TV shoppers in the
store. In this section, we'll offer some tips on
become a more discerning viewer and what
separates good pictures from the rest.
Image quality factors: The wall of tubes |
Features that enhance picture quality | View
LCD TV's NOW
Calibration
The wall of tubes
Most electronics stores show their
televisions on a big wall, fed by the same
video signal split a hundred times. Although
bright lights, suspect salespeople, and a lack
of remote controls will probably make any
picture-quality judgment difficult, here are a
few things to look for on the wall. Don't fall for
brightness. Almost every television on the
sales floor is set to the brightest picture
settings, so try to get the salesperson to
reduce the controls of the TVs you're
comparing. You want the pictures--not
necessarily the controls--to be roughly equal
in brightness, contrast, and color.· Go out
of the light. Few living rooms are as well lit as
the sales floor, so see if the salesperson can
reduce the amount of light shining on the
picture. If nothing else, try to shade the
screen if light is shining directly on it. If you
have a DVD that you're familiar with, see if
you can use it instead of the TV signal that's
normally shown. Aside from HDTV, which
isn't very portable at the moment, DVD
provides the best picture a television can
display, so it makes for a good reference
from which to judge.
·
Try all the picture modes. Many sets come
with numerous picture presets, such as
Movie and Sports, that radically affect how
the image appears. After you peruse the
manually adjusted pictures, try the different
presets and modes to see which ones look
best.
Features that enhance picture quality
Normal analog TVs, as opposed to digital TVs,
have just a few factors that affect picture
quality. Look for these features or
characteristics and disregard other features
that sound good on the surface but in reality
are just marketing ploys. Naturally, there are
other important factors we can't cover here,
but this should get you started. ·Comb filter. If
a television does not have a comb filter, its
resolution will be limited to about half the full
potential of DVD. Most sets with comb filters
can provide all of the resolution of DVD. The
types of comb filters you'll see advertised, in
order of lower to higher quality, include two-
line, three-line, digital, and 3D YC varieties.
They provide incremental improvements in
performance, especially in reducing
rainbows that can appear in fine detail, such
as a talking head's suit coat. Comb filters
affect only composite-video or RF
connections (see Inputs and outputs).· Color-
temperature settings. Many televisions have
presets for color temperature, which is
basically the color of gray. A neutral gray is
ideal, but most TVs have an extremely blue
gray to make the picture brighter in the store.
TVs with color-temperature presets allow
you to choose the color of gray; generally,
you'll want the reddest or lowest setting
available.
· Color decoder. Most TVs' color
decoders are set to be too red to counteract
the blue color temperature described above.
TV makers don't advertise accurate color
decoders, so you'll have to judge for yourself
or trust a reviewer. In the store, look for pale
skin tones that don't appear too flushed and
reds that don't bleed into other colors or
otherwise seem more intense than the rest
of the palette.
· Geometry and convergence. Most TVs
get bumped around in shipping, so it pays to
check convergence before you take yours
home--or at least before the warranty
expires. Look toward the edges of the
screen, preferably with graphics or other
straight lines (CNN's crawling ticker works
great), and see if the lines are actually
straight. To check convergence, look at the
corners with white material, preferably lines
again, and see if faint halos of color surround
the white. Back to top
Calibration
You'll often see CNET reviews mention
calibration or the ISF. When they review high-
end televisions, our reviewers access a
service menu using codes that aren't
available to the average consumer, and they
use that menu--along with specialized
equipment such as color analyzers--to
calibrate the TV for optimal display of video
according to NTSC standards. The Imaging
Science Foundation, or ISF, has a program
that trains professionals to calibrate
televisions, and for a few hundred dollars,
you can retain an ISF professional to adjust
your TV. Alternatively, you can use a
calibration DVD to help you adjust the
television. These discs, such as Ovation
Software's Avia, Joe Kane's Video Essentials,
and Sound & Vision's Home Theater Tune-Up,
show you how to optimize your set within the
limits of the standard user-accessible menus.
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