Owner's Manual

Put
a check in the row labeled,
"Red,
green,
and
blue
not
clipped"
if
the red, green,
and
blue portions
of
the pattern show four visible darker squares each.
Color
Conversion
The boxes at the
bottom
center
of
the pattern are to check for two
common
errors
in doing the color conversion from
Y'CbCr
to RGB. All
HD
signals are supposed
to be converted using the equations in the
BT.
709
specification,
not
the
BT.60
1
specification (which
is
for standard definition
NTSC
TV). The three boxes at the
bottom
are to check which color conversion standard
is
being applied. The middle
white box
is
just to check for clipping, which would invalidate the rest
of
the
check.
You
should see a darker gray box in the middle
of
the white box.
If
you
don't, skip this test
and
leave the checkbox blank.
Assuming the white box has a smaller box inside it, check that the green box labeled
"709"
has a darker box inside it,
and
the red box labeled
"60 1"
is
solid red with no
darker box. This indicates that the color conversion
is
being
done
using
BT.
709.
If
the white
and
red boxes have smaller boxes inside them,
but
not
the green box, that
indicates the color conversion
is
being done using
BT.60
1,
which
is
incorrect.
Check
all the various color spaces
and
for each one
if
just the white
and
green
boxes have smaller boxes visible,
then
put
a check in the row labeled
"BT. 709".
Otherwise, leave it blank.
The boxes
on
the very
bottom
center, labeled
"Chroma
Range Check," are to check
for an error that some color conversion chips have where the
chroma
is
converted
using the same range
as
the
luma
channel. This isn't
correct-
chroma
has a nominal
range
of
224
in 8-bit, while
luma
has a nominal range
of
219.
Using the
luma
range for all three color channels causes subtle color errors.
If
the nominal range
is
correct, you should be able to see four very faint darker boxes in the red
and
blue
rectangles,
and
a single darker box in the green box.
Check
all the various color spaces
and
for each one
if
you can see the interior
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