CurtPalme.com Home Theater Forum

jacket_fan · Joined: 02 Sep 2007 Posts: 99

I have an XG that I am in the process of getting set up after getting a Lumagen scaler. I have completed setting up the geometry and convergence. Next I used the Spears and Munsil test dist to set grey scale and looked at the other tests they have and things look good other than a purple tint. This tint has to be due to the new scaler.

It is consistent between 3 sources, BR, HD-DVD and cable.

Is this something I try and fix in the Lumagen or in the projector?

And how is the best way to adjust color without any fancy hardware?

Thanks,

dturco · Posted: Wed Mar 02, 2011 1:36 pm Post subject:

Which Lumagen? It sounds like you have a color space issue.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

You have to see what your Sources out put color space wise as Dave mentioned.

If your BD player can output YCbCr 422 try to use that , set the input for the lumagen to the same setting and also the output fromthe lumagen. The moome card will auto select the YCbCr 422.

It is all explained in the manual of the lumagen.

Athanasios

dturco · Posted: Wed Mar 02, 2011 2:37 pm Post subject:

Yep, the colorspace is really important. If you have a truly NEW Lumagen all HDMI it will do 422 colorspace and you should set it and the colorspace of your devices to 422. But If you have a "new to you" Lumagen the DVI models, they only do RGB or HDMI/DVI 444. If the source device is set to 422 or something else the older Lumagens don't like, you get weird colors on the screen

So Colorspace. Wink

jacket_fan · Joined: 02 Sep 2007 Posts: 99

I do have a new XS. I will check this evening as to color space. I know Ihave seen that option in the menus on the Lumagen.

CIR Engineering · Posted: Wed Mar 02, 2011 7:01 pm Post subject:

Is the picture almost all purple and you can hardly make anything out, or is the picture just a little purplish?

If it is just a mild purple tint than it is not color space and is most likely a gryascale issue.

Post a screen shot.

craigr

jacket_fan · Joined: 02 Sep 2007 Posts: 99

It is more of a "purple haze". I notice it in the greens as well as white.

I did adjust the "black" and "white" controls with the Lumagen in doing the gray scale. I am likely a bit hot in the black. Stuck in the trusty Fifth Element and looked at the scene where the suits come out of the wall, which has been my standard.

Again, used the Spears and Munsil test disk for the baseline. I don't remember the settings but did not have to adjust very far from "0" to get it right.

I will try to get a decent screen shot. And will post tonight.

jacket_fan · Joined: 02 Sep 2007 Posts: 99

Gentlemen,

I did go in and change the color space. I ended up leaving the Lumagen set to auto, because any other setting caused severe changes. I believe I am stuck with something other than a color space mismatch.

I have found I am not qualified to take screen shots. I need to work on my photography skills. But here is result of some attempts last night. I believe you can see the tint in the pictures attached.

What should I try next?

From the Oppo

From cable box

another from cable

For some strange reason I can't get the Hendricks tune of purple haze out of my head. Smile

dturco · Posted: Thu Mar 03, 2011 12:35 pm Post subject:

can you get your sources to the P/J without the lumagen? If you can try OPPO or cable direct to P/J no Lumagen. If the picture is still purple then your P/J is out of adjustment. If it clears the "Jimmy Hendrix" from the screen, then the lumagen is off. To adjust the Lumagen ....wait for Craig, I don't know.

CIR Engineering · Posted: Thu Mar 03, 2011 1:19 pm Post subject:

Not color space.

If your sources are connected to the Lumagen through DVI/HDMI and the problem is coming from the Lumagen than I have no idea. This looks like a projector issue and most likely bad grayscale adjustment. If it is the Lumagen, try resetting to factory defaults as nothing setup properly should do this.

craigr

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

I agree with Craig Looks like your lacking Green.

How does the green tube look? Is it dim? Is it on at all?

Athanasios

jacket_fan · Joined: 02 Sep 2007 Posts: 99

Thanks for the responses.

Getting a cable from the equipment to the pj would require me to go out and buy a 15 - 20 foot cable. Or, I could pull the Lumagen out of the rack and place it with the projector. That would be something I could try. Good trouble shooting suggestion.

Yes all sources are connected via HDMI, except for a processor which is connected via composite. I did not think to look at what the Lexicon via composite looks like. I guess I can look to see if the letters are tinted.

The set up is Source>Lumagen>Moome Card>Projector. I have a 35 foot HDMI cable from Blue Jeans cable from the Lumagen to the internal Moome card. The cable is a thick diameter beast. This is my first experience with a long run HDMI cable.

jacket_fan · Joined: 02 Sep 2007 Posts: 99

Not the Lumagen. Went directly from the Oppo to the pj, and still am in a purple haze. So it is in the pj. Or could it be in the Moome card.

Looking at the tubes, it is difficult for me to decide if one tube is less bright than the other.

What do you guys suggest I do next?

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Can the NEC display internal patterns? If so does it have an internal greyscale pattern? If so can you display that and see if the greyscale is tinted in the same way video is?

Also if you can cycle through the colors one by one to see if one is more dim on screen than the others. Id use the full white screen.

If you can take pic of the greyscale internal pattern it be of help.

Athanasios

kschmit2 · Posted: Fri Mar 04, 2011 2:15 pm Post subject:

well, even the window white or all-white test-pattern would have the purple tint.

But the XG also has a greyscale pattern

first hint: either green is too dim (low emission) or red+blue are too bright.

CIR Engineering · Posted: Fri Mar 04, 2011 3:37 pm Post subject:

jacket_fan · Joined: 02 Sep 2007 Posts: 99

When I display an all white screen, I am in the purple haze. Mad

I cannot tell by cycling through the 3 colors if one is brighter on the screen than the other - on an all white screen. If I look into the rasters with the Blu Ray playing, I believe the red is brighter. But it could be that the green is too low. It is had to tell from memory, but it appears that the green lettering and numerals from the XG menu are not as bright. This could be my imagination, but a possibility.

The other thing that is obvious is that there is too much red. It is obvious when there is a black screen. Watched "Salt" with my sons last night and the red was obvious in the dark sceens. It is not a problem with the menu showing, only with a source playing. Where is the proper place to start to tone down the red with with the XG to start?

Can someone walk me through starting from scratch and doing a new signal entry. I have never done one from scratch. Always copied what Terry had done. I am having a hard time with this either using the manual, or Curt's guide. A while back I tried setting up a 1080p entry and failed miserably with it.

Thanks again,

dturco · Posted: Fri Mar 04, 2011 4:22 pm Post subject:

Well now we have what is wrong. But without a Colorimeter doing anything maybe asking for more trouble. I have never seen a NEC projector but here is a link to your White Balance controls.

http://www.curtpalme.com/NECPG_Layout7.shtm

I have no idea which one is which or which way to turn them. I know nothing.

Proceed with caution.

jacket_fan · Joined: 02 Sep 2007 Posts: 99

CIR Engineering · Posted: Fri Mar 04, 2011 4:40 pm Post subject:

Yeah, don't touch the pots, just go into the service mode and adjust in the white balance menu. Look at the grayscale for dummies thread...

craigr