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Lowering color temperature

475 Views 9 Replies 6 Participants Last post by  Mark Hunter
I have a NEC MT1030 LCD proj. This proj. is designed for business presentations. It is my understanding that most of these type of projectors have a higher color temperature to make presentations really bright. As I understand it a higher color temp means that it is bluer. If this is true than does adjusting the white balance, by boosting red and green and lowering blue contrast and brightness, lower the color temp to a proper level for HT?
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A higher than 6500K color temperature is a cooler blue tinted picture. A lower than 6500K color temperature is a warmer red. Seems like an oxymoron. :eek: The higher cooler blue stands up better under florescent lights which are a higher color temperature themselves. You should first check and see if there is any color temperature adjustment. Maybe in a service menu. If not I would use Video Essentials or other test disk before making so many blind adjustments.
I have made adjustments to brightness, contrast, color saturation, and tint using AVIA. If those are set properly then is my proj. set at the proper color temp? Do I need to use other more advanced calibrations on the AVIA disk?

Yes the white balance controls will do it for you.

The best way to tell as far as I am concerned is to watch a black and white movie or if you have a compnent input, pull the Cr and Cb cables out.

Does the resulting picture look Black and White? Does it look slightly blue or green, etc..

Use your white balance controls, specifically the RGB contrast controls to fix the problem.

On thing to keep in mind however, You probably have a coolish looking picture which means you'll need to lower you blue (and maybe green) to achieve better white balance. This will lower your light output and thus your overall peak contrast.

An external filter or colored screen will do the same without lowering your contrast just your light output.

-Mr. Wigggles
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Hi Ron, although you would think that it would be easy, it's actually quite impossible to get colorimetry right just by using the naked eye.

If you are a real stickler for accurate video, you might want to use some instrumentation to get it right once, so you know what it is supposed to look like.

This is probably more than you wanted to know about this topic, but if you are interested, you can see the type of tool that I use to do exactly what you were asking about on a few "hidden" web pages.

The web site isn't done, but take a look at:

The White Point Target
The RGB Levels Meter

(Hint: Click on the "Locate" button to get your bearings once you are in the site...can any Javascript gurus out help me make that run immediately upon entering the page??)

Anyway, those instruments make it practically impossible to get the colorimetry wrong. If you hit the "bulls eye" on the target, and get all three of the RGB levels to 100%, you have exactly the reference illuminant (D65), no questions about it.

Most of these business projectors are set to a much bluer (and boardroom brighter) 9300 Kelvin instead of the more accurate for video 6504 Kelvin (D65).
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Just to prove I actually read the links above - there is a typo in the RGB Levels Meter page. It says that changing the blue may affect the green and **blue**. I assume that last **blue** should be **red** ? Or is it my face that is red. :eek:

Use a

where time = your time

url = your url

if you want it to happen immediately set the time to 0.

This needs to be in the HEAD section of your page.

Good luck
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Instead of lowering the blue and green contrast to warm up the picture, couldn't I repaint my gray screen with some red tint added in? By doing this I would not have to lower light output.

Bingo. You'll have a pink screen. I did one for my friend's Sanyo XP18n.

Worked real well. The Sanyo, like most UHP's, is quite blue.

Since I didn't kill the green as much as I did the blue, His screen was actually trending towards the peach side of pink.

Hope that helps.

-Mr. Wigggles
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Peter - Right you are on that typo...

My editor should have caught that before she released these files to me!

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