B&K Precision 1253 - Manual - Manual (Page 7)

Patterns
1: SMPTE Bars
(Society of Motion Pictures and Television Engineers)
Description: 7 equal width vertical bars in 3 groups. The top 2/3 of the pattern contains White (R+G+B),
Yellow (R+G), Cyan (G+B), Green (G), Magenta (R+B), Red (R), and Blue (B) bars, from left to right, at
75% (100% saturation).
The middle 2/15 of the pattern contains the blue's complement color for each of the bars above which
contain blue: Blue (B), Black, Magenta (R+B), Black, Cyan (G+B), Black, and White (R+G+B)
The bottom 1/5 of the pattern contains the following bars:
-I, White 100%, Q, Black, Blacker-than-black at -5 IRE (2.5 IRE for NTSC), Black = 0 IRE (7.5 IRE for
NTSC), and Lighter than-black at 5 IRE (12.5 IRE for NTSC).
Pattern Usage: Use to adjust color and hue through a blue filter. While viewing the pattern through a
blue filter (Wratten 50), adjust the color control for equal brightness white/blue bars. Adjust the hue
control for equal brightness cyan/magenta bars. Also use this pattern to adjust a display’s black level at a
medium APL. With the brightness (black level) control first adjusted to a slightly higher than normal
setting, reduce the brightness control setting until the slightly blacker than black bar (under the large cyan
bar) and the black bar (under the large red bar) are both just black. The slightly whiter than black bar
(under the large blue bar) should still be slightly visible.
Monitor setup with these color bars is fairly simple. With SMPTE color bars on the monitor, again adjust
brightness so the -5 IRE (2.5 IRE for NTSC) pluge signal just disappears. If you can't see it, adjust
contrast and brightness to raise the black level towards gray. Then reset the brightness to just make the
lowest step disappear. Next, turn on the blue gun only and adjust the monitor Hue (phase) so first there
are four blue bars separated by three black bars. Third, adjust the Color (chroma) so the outer two blue
bars match between upper and middle bands. Finally, fine tune phase so the middle two bars match
between upper and middle bands. If required, fine tune Hue and Color so there is no visible difference
between any of the blue bars in the first and second bands.