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From: jroth@allvax.dec.com (Jim Roth)
Newsgroups: comp.graphics
Subject: Re: NTSC test pattern
Summary: This is in EIA standard RS189 "Encoded Color Bar Signal"...
Message-ID: <2497@ryn.esg.dec.com>
Date: 12 Aug 90 17:38:52 GMT
Sender: guest@ryn.esg.dec.com
Organization: Digital Equipment Corporation
Lines: 52

-Message-Text-Follows-

In article <12947@mentor.cc.purdue.edu>, ahg@mentor.cc.purdue.edu (Allen Braunsdorf) writes...
>I've got my digitizing stuff hooked to my VCR now and I'm trying to
>calibrate it properly.

>The local cable company broadcasts a test pattern continuously on one
>channel and I'm using that to try to get my color right.

   Not that I'd trust the accuracy of their test pattern :-)

>Here's a rough picture:
> 
>+---+---+---+---+---+---+---+
>|   |   |   |   |   |   |   |
 ...
>|   |   |   |   |   |   |   |
>+---++--+-+-+--++---+---+---+
>|    |    |    |            |
>+----+----+----+------------+
> 
>Each outline is filled with a solid color.  The bars at the top are
>greyish- white, yellow, cyan, green, violet, red, and blue.  The three
>boxes are a dark blue, pure white, and a not as dark blue.  The rest of
>the bottom row is dark black.

>Does anyone know the proper YIQ or RGB values of these areas?

The color bars are saturated at 75 percent of full amplitude.

You should see (in IRE units)

		     luminance chroma p-p chroma phase
		     --------- ---------- ------------
	gray	R+G+B	77
	yellow	R+G	69	  62		167
	cyan	G+B	56	  88		283
	green	G	48	  82		241
	magenta	R+B	36	  82		 61
	red	R	28	  88		103
	blue	B	15	  62		347

The region below the bars contains:

	-I reference subcarrier (303 degrees)
	reference white, 100 IRE units
	+Q reference subcarrier (33 degrees)
	reference black, 7.5 IRE units

Also, blanking is at 0.0 and the synch tips are at -40.0

- Jim