Two projector images on top of each other?

[nizer]

I can't seem to get my brain around how to have 2 identical projectors on a triplehead2Go in QLab to project the same image directly on top each other to essentially double my lumens.

I tried all kinds of settings and tweaks with no joy.

The 2 projectors are native 800 x 600.

Thanks for any guidance oh great QLab Forum.

[Jevans]

It's often a lot simpler than that - if the projectors have a passthrough output a VGA/RGBHV patch cable between the stacked projectors will do the job in hardware. Otherwise a VGA splitter would be a pretty easy and inexpensive option.

If you're determined to do it through the TH2G then create a surface, insert two screens corresponding to the two partial outputs of the TH2G and then drag one on top of the other. Off the top of my head when they're overlapped by more than 90% I think QLab determines you're double stacking them and sends the same output to both screens.

What are you having trouble with?

Thanks,

John

[Sam Kusnetz]

Jevans wrote:
> It's often a lot simpler than that - if the projectors have a
> passthrough output a VGA/RGBHV patch cable between the stacked
> projectors will do the job in hardware. Otherwise a VGA splitter would
> be a pretty easy and inexpensive option.

I cannot overstate how much I encourage either of these options instead
of a trick with the TripleHead2Go.

Best
Sam
--
Sam Kusnetz | Figure 53 Field Operative
s...@figure53.com

[freeun...@gmail.com]

A pass thru never lets me tweak the alignment. It is always a double image. 

Mark Nizer/Neisser

📩 Ni...@active-media.com

📲 434-974-9699

💻 http://activemedia.org

💻 http://Nizer.com

--
--
Change your preferences or unsubscribe here: http://groups.google.com/group/qlab

Follow Figure 53 on Twitter: http://twitter.com/Figure53

--- You received this message because you are subscribed to a topic in the Google Groups "QLab" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/qlab/uvzMKSEaFQI/unsubscribe.
To unsubscribe from this group and all its topics, send an email to qlab+uns...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

[micpool]

Create an 800 x 600 surface

set the triple head to 2400x600 resolution

Assign  (3 wide partial screen 1) and (3 wide partial screen 2) on the triple head to the surface.

Place the 2 screens on top of each other and deselect edge blending.

If you go to 400 percent magnification you can just about deal with the fact that you can't easily select the corner points for each screen as they are on top of each other.

There does seem to be a bit of a video  performance hit as well, but if your source vids are 800x600 in pro res LT or proxy on a good machine you will probably be OK.

I think if I were doing this with lo res projectors I would get an old analogue edition VGA  DH2G off ebay as they seem a lot less hassle than the newer triple heads.

Some newer  triple heads will allow you to configure them in dual head mode and this may work better. So you would have a 1600x600 surface with 2 wide partial screens  instead.

Mic

On Monday, March 23, 2015 at 8:20:30 PM UTC, nizer wrote:

[Andy Dolph]

best way to do this is with a VGA splitter / DA (distribution amp)  then  you know both projectors are getting the exact same signal.

Start from there.

--

--
Change your preferences or unsubscribe here:
http://groups.google.com/group/qlab
 
Follow Figure 53 on Twitter: http://twitter.com/Figure53

---

You received this message because you are subscribed to the Google Groups "QLab" group.
To unsubscribe from this group and stop receiving emails from it, send an email to qlab+uns...@googlegroups.com.

[micpool]

As Mark said in his last post this doesn't give him the control he requires. If you have full spec projectors in a dual stack cradle then you will have all the controls you need to overlay the images. If you are using 2 boardroom projectors perhaps side by side then these probably dont have the geometry controls built in to get a perfect overlay.

He doesnt want an identical image. He wants one image on the screen and the second image overlayed using the Qlab corner pins and geometry to ensure a perfect line up.

Mic

[Andy Dolph]

I've never tried to use Qlabs adjustments to do that - are they fine enough to make that practical?

[Sam Kusnetz]

Andy Dolph wrote:
> I've never tried to use Qlabs adjustments to do that - are they fine
> enough to make that practical?

Yes!

[Andy Dolph]

wow, cool.

--
--
Change your preferences or unsubscribe here: http://groups.google.com/group/qlab

Follow Figure 53 on Twitter: http://twitter.com/Figure53

--- You received this message because you are subscribed to the Google Groups "QLab" group.

To unsubscribe from this group and stop receiving emails from it, send an email to qlab+unsubscribe@googlegroups.com.

[Sam Kusnetz]

I should qualify that: unless your projectors are very, very out of alignment physically, like at wildly different angles or distances, QLab (with a Pro Video license) has got you covered.

-sk

Andy Dolph

March 24, 2015 at 4:47 PM

wow, cool.

--
--
Change your preferences or unsubscribe here:
http://groups.google.com/group/qlab
 
Follow Figure 53 on Twitter: http://twitter.com/Figure53

---
You received this message because you are subscribed to the Google Groups "QLab" group.

To unsubscribe from this group and stop receiving emails from it, send an email to qlab+uns...@googlegroups.com.

For more options, visit https://groups.google.com/d/optout.

Andy Dolph

March 24, 2015 at 4:40 PM

I've never tried to use Qlabs adjustments to do that - are they fine enough to make that practical?

--
--
Change your preferences or unsubscribe here:
http://groups.google.com/group/qlab
 
Follow Figure 53 on Twitter: http://twitter.com/Figure53

---
You received this message because you are subscribed to the Google Groups "QLab" group.

To unsubscribe from this group and stop receiving emails from it, send an email to qlab+uns...@googlegroups.com.

For more options, visit https://groups.google.com/d/optout.

micpool

March 24, 2015 at 3:40 PM

As Mark said in his last post this doesn't give him the control he requires. If you have full spec projectors in a dual stack cradle then you will have all the controls you need to overlay the images. If you are using 2 boardroom projectors perhaps side by side then these probably dont have the geometry controls built in to get a perfect overlay.

He doesnt want an identical image. He wants one image on the screen and the second image overlayed using the Qlab corner pins and geometry to ensure a perfect line up.

Mic

Andy Dolph

March 24, 2015 at 1:08 PM

best way to do this is with a VGA splitter / DA (distribution amp)  then  you know both projectors are getting the exact same signal.

Start from there.

--
--
Change your preferences or unsubscribe here:
http://groups.google.com/group/qlab
 
Follow Figure 53 on Twitter: http://twitter.com/Figure53

---
You received this message because you are subscribed to the Google Groups "QLab" group.

To unsubscribe from this group and stop receiving emails from it, send an email to qlab+uns...@googlegroups.com.

For more options, visit https://groups.google.com/d/optout.

nizer

March 23, 2015 at 4:20 PM

I can't seem to get my brain around how to have 2 identical projectors on a triplehead2Go in QLab to project the same image directly on top each other to essentially double my lumens.

I tried all kinds of settings and tweaks with no joy.

The 2 projectors are native 800 x 600.

Thanks for any guidance oh great QLab Forum.

--
--
Change your preferences or unsubscribe here:
http://groups.google.com/group/qlab
 
Follow Figure 53 on Twitter: http://twitter.com/Figure53

---
You received this message because you are subscribed to the Google Groups "QLab" group.

To unsubscribe from this group and stop receiving emails from it, send an email to qlab+uns...@googlegroups.com.

For more options, visit https://groups.google.com/d/optout.

[Drew Schmidt]

It's sometimes difficult to drag the corner pins into the correct location. Use the arrow keys to nudge each individual corner. Nudging is your friend. Nudging is most certainly "fine" enough the precision necessary to stack / overlay two projectors. I do this often. Usually with three projectors actually. 

[Sean Dougall]

You can also shift-drag for finer control, or (if you don’t mind looking back and forth between the screen and the stage) use the Selected Control Point text fields to adjust the position numerically. But I agree that nudging is generally the easiest option.

--
Sean Dougall
se...@figure53.com

[freeun...@gmail.com]

great info all. Heading to the theater now to give it a try.

[nizer]

Ok…It works!!!! Lining up the projects as close as possible, then following Micpool's directions and using the arrow keys really let me tweak it in. Looks great. tempted to try three projectors now.

THANK YOU ALL.