For consumer displays, the Aviaand Digital Video Essentials
discs contain a variety of patterns for television displays. I don't recommend downloading test images off the web; many are either totally inaccurate or designed for use with a specific type of material. In most cases, using incorrect test patterns is worse than not using them at all.
Thanks for the info Matt. I want to check my raster alignment and possibly adjust if needed. Back in the day I used to have a small, hand held generator that produced color bars and a crosshatch I think. I beleive it was powered by a 9V battery. I have no idea where it's at nowadays. Do you know of any kits that can be built that would give me what I need?
With test pattern DVDs that turn any DVD player into a decent generator (for cheap) like the ones I mentioned above, I'm not sure I would say building your own generator is practical. That said, it could be a fun DIY project. IF you're into that kind of stuff, why not? :-)
Here's a few links to get you going. If you do build one, I'd love to see a thread or article on what you did to make it with lots of pictures!
Matt, thanks for the links. While looking at these I had an idea. Couldn't I get a test pattern card and put it on the screen with a camcorder? If I frame it up properly shouldn't that work?
Wizbangdoodle said:
Matt, thanks for the links. While looking at these I had an idea. Couldn't I get a test pattern card and put it on the screen with a camcorder? If I frame it up properly shouldn't that work?
I've never tried that approach, so I can't vouch for how accurate that would be. You could certainly give it a try. :-)
For consumer displays, the Avia
and Digital Video Essentials
discs contain a variety of patterns for television displays. I don't recommend downloading test images off the web; many are either totally inaccurate or designed for use with a specific type of material. In most cases, using incorrect test patterns is worse than not using them at all.
What are you trying to do?
Thanks for the info Matt. I want to check my raster alignment and possibly adjust if needed. Back in the day I used to have a small, hand held generator that produced color bars and a crosshatch I think. I beleive it was powered by a 9V battery. I have no idea where it's at nowadays. Do you know of any kits that can be built that would give me what I need?
With test pattern DVDs that turn any DVD player into a decent generator (for cheap) like the ones I mentioned above, I'm not sure I would say building your own generator is practical. That said, it could be a fun DIY project. IF you're into that kind of stuff, why not? :-)
Here's a few links to get you going. If you do build one, I'd love to see a thread or article on what you did to make it with lots of pictures!
http://web-ee.com/schematics/electronic_projects/test_pattern_generator/
http://www.getprice.com.au/Handheld-TV-Pattern-Generator-Kit-Gpnc_543--3...
http://lea.hamradio.si/~s51kq/VIDEOG.HTM
If you just wanted to buy one, here's a few options that looked nice. If you look around, I'm sure you'll find more choices:
http://www.mcmelectronics.com/product/73-995&CAWELAID=220586625
http://www.hallresearch.com/page/Products/DVC-3
Matt, thanks for the links. While looking at these I had an idea. Couldn't I get a test pattern card and put it on the screen with a camcorder? If I frame it up properly shouldn't that work?
I've never tried that approach, so I can't vouch for how accurate that would be. You could certainly give it a try. :-)
"Try not. Do. Or do not." - Yoda
http://en.wikipedia.org/wiki/Monoscope