Collage Overlapping & Image Size Calculations

Greetings. Just trying to do some image size / throw length calculations for some upcoming projects with DL.2 and I am wondering how much overlap you should allow for when using Collage Generator and figuring total image size?

I.e. We need to fill a 20' x 56' screen with a 2 x 3 array and I would like to keep the zoom as tight as possible for maximum brightness. So.....

1. How far away will we need to be with projectors?
2. What will the total image size be for that array?

What I am really looking for here is a formula or better yet a % of overlap that I can use for figuring Collage screen size in the future. Thanks!

Travis Slyter
Ruehling Associates, Inc.

0 sblair - Former HES Forum Member over 17 years ago

Travis,

You can find the Throw Distance/Image Size chart here: www.highend.com/products/digital_lighting/dl_1-dl_2_projection_chart.asp

I would plan for about a 20% overlap region for a good blend when using Collage.

Scott
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 TBS Lighting over 17 years ago

Scott,

Thanks for your help. I had already located the throw / image size chart hence the question about percentage. I am assuming the 20% is per edge blended, so if you have a center screen in an array with both sides blended it's actually 40% overlap? Thanks again.

Travis
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 sblair - Former HES Forum Member over 17 years ago

I did some real investigation for you. It is ~9% overlap per edge after the image has been keystone corrected. So if you have to do lots of keystone adjustment you'll lose image size due to that and then subtract the 9% per edge at that point.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 TBS Lighting over 17 years ago

What is the maximum resolution for this configuration as well as the aspect ratio? It is not listed in the array size chart. Thanks.

Travis Slyter
Ruehling Associates
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 TBS Lighting over 17 years ago

Also when you say 9% per edge I want to clarify. If you have 2 projectors blending is that 9% for EACH edge from both projectors (18% total) or is it 9 % for the ENTIRE edge with each image only losing 4.5% (9% total)? Thanks.

Travis Slyter
Ruehling Associates
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 sblair - Former HES Forum Member over 17 years ago

When you overlap two projectors you are overlapping 9% of the edge on one projector to another projector. So for 2 projectors I'd say you are losing 4.5% of the total combined width of those two projectors.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 TBS Lighting over 17 years ago

Great!

That helps, so what is the maximum image resultion and aspect ratio of an array 2 high and 3 wide as they are not on the charts? Thanks.

Travis Slyter
Ruehling Associates, Inc.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 sblair - Former HES Forum Member over 17 years ago

We don't have a 2x3 as an option as all the blending configuration at the moment. You would need to do two seperate 1x3's if you wanted a 2x3.

You can see all the options listed here:
www.highend.com/support/digital_lighting/dl2supportguide/Collage-generator/dl2-collage-arrays.asp

We try to keep the total pixels below 1 million. So you can tweak the resolutions to stay in about that range.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 TBS Lighting over 17 years ago

Scott,

Thanks so much for all your help. I went to page that you listed before I posted, hence my question as to why the configuration is not listed. However on the page for console congifuration

www.highend.com/support/digital_lighting/dl2supportguide/Collage-generator/dl2-collage-console-setup.asp

it listed numerous array configurations that are not listed on the array page, so it's confusing information hence my post. So would I be safe in confirming that not all of the array configurations that are listed in the console configuration instructions are supported yet? Again thanks for all your help.

Travis Slyter
Ruehling Associates
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel
0 sblair - Former HES Forum Member over 17 years ago

Yep. You are right. I'll see if we can get the other page updated.

Here's another useful thread on the subject: forums.highend.com/showthread.php?t=2387

In general, you multiply the number of fixtures wide by 640 and the number of fixtures high by 480. Then you scale the resolution down so that when you multiply the resolution widthxheight you are below 1 million pixels. If you do that to all the resolutions we have listed on the Collage content page you will see they will come out at 750k pixels.

Then read the other thread I posted above and it will go into even more detail about how resolution/compression affect bit rate and performance.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel