View Full Version : Need some TV test patterns

Oldbitcollector (Jeff)
07-12-2009, 01:41 AM
Got a 72 inch projection TV off the local freecycle.
I just fixed the audio, now I need to re-align the projectors (RGB)

I'd like to use the Prop. Anyone got any recommended TV test patterns?


New to the Propeller?

Visit the: The Propeller Pages (http://www.warrantyvoid.us/tiki-index.php?page=Propeller) @ Warranty Void.

Toby Seckshund
07-12-2009, 02:11 AM
If it handles VGA, Ntest (by Nokia) will give colours and some cross hatches

Style and grace : Nil point

07-12-2009, 03:15 AM
I used to have a Big Box that I could slide celephane into with a pattern like the Indian head, etc. that would generate a signal. Got rid of it 30 years ago. But, video editing software like Adobe Premiere, Ulead, I believe Vegas generates there own customized test patterns. Also, do a google search.


07-12-2009, 03:18 AM
What you need is a crosshatch generator. Also, I think these programs can generate that too. I mean, to adjust the convergence. Sometimes, the TV prodjector or TV set has the pattern built in too. look closer. Maybe it will help.

Good Luck!


Toby Seckshund
07-12-2009, 04:14 AM
Indian's head, that would be Ampex then. Videos you could fix with a set of spanners. Thats the level I started at, wish they were still about, not the bent tin chassis of today. As a bonus they had chips that could be salvaged.

Style and grace : Nil point

07-12-2009, 04:29 AM
Man, I just hate aligning convergence on old projectors! (we used rectangles) .... This should be very simple to make with Propeller. The hardest thing about the NTSC bars (other than never twice same color and getting over the unsolvable magenta/green gap problem) was tuning up the three shades of black. Good luck with all that OBC.


Propalyzer: Propeller PC Logic Analyzer (http://www.brouhaha.com/~sdenson/Propalyzer)
http://forums.parallax.com/showthread.php?p=788230 (http://forums.parallax.com/showthread.php?p=788230)

07-18-2009, 03:58 AM
I like to use this for patterns.


Dennis B. Page

07-18-2009, 06:27 AM
I just spotted this on the third party propeller products page.

www.vgaok.com/ (http://www.vgaok.com/)
It uses some simple rectangles for a test image, shouldn't be too hard to mimic.