AVS Forum banner
  • Our native mobile app has a new name: Fora Communities. Learn more.

Where to adjust picture settings (dvd player, projector, or iscan)

352 Views 2 Replies 2 Participants Last post by  yubyub
I have a Panasonic 75U projector, hooked up to an Iscan Ultra and a Mitsubishi dvd player. All 3 devices have adjustments for brightness, contrast, hue, color, etc. Which device do I use to calibrate the picture? Do I just leave the defaults at zero on the dvd and projector and use the iscan? or use the adjustments on the projector only and leave the iscan and dvd player at the defaults? Can anyone suggest the proper thing to do?

Also, if I leave my projector set to 16:9 and my dvd player to 16:9 wide, am I losing anything by having the Iscan scale the old letterboxed and 4:3 dvd's ?


Not open for further replies.
1 - 3 of 3 Posts

Someone who ISFs devices may be able to correct me, but the proper way from what I know (and from what has worked for me) is to first calibrate each component's electrical interface. Component signals (like many other signals) have standards to which they should ahear i.e. a 7.5 IRE window gives x voltage, whereas a 100IRE window gives y voltage.

Once you've calibrated your electrical interfaces, you can calibrate your projector/CRT/whatever to show the calibrated signals properly.

When you get to the point of calibrating your display, you may need to tweak something downstream (like the brightness on your IScan, for instance) to give the projector enough range to calibrate. This should probably be used as a last resort - try to calibrate everything using each device's own tweaks first.

The idea behind this is that while you could leave everything alone except your display and get a good greyscale tracking out of it, it's possible that you're loosing definition due to bad signals (i.e. crushed whites, etc...). If a device has a range which is %125 of the spec'd voltage for a signal, that extra %25 could cause distortion, loss of picture information, etc... On the other hand, it may not cause any problems. Caveat emptor.

You'll probably need at least 1) a disc or other source with a few test patterns and an osciloscope. Cliff Watson has a great page on how to do this with a video card:


Indeed, Cliff has "scoped" a number of different drivers for the ATI series - check out the results on TheaterTek's support forums:


See less See more
P.S. - I made a suggestion to Mark Hunter, the rep from ColorFacts, that he create an electrical calibrator for ColorFacts. Right now, ColorFacts has a sensor which can analyze R, G and B components of light, so you can calibrate your projector. My idea was to create a similar sensor which takes its readings from component signals, and allows you to analyze the specs of the signal in comparison to the standards.

I think it would be a great idea - this way, with ColorFacts, you'd be able to calibrate your whole chain of components quite easily.

1 - 3 of 3 Posts
Not open for further replies.