Forum : Advice & Critiques

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Topic: Stitching two or more synths

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planetsurfur07 (Over 1 year ago)
Is there anyway to stitch two or more synths together, to create a larger synth, if the photos from the end and beginning of a subsequent synth match up?
Nathanael (Over 1 year ago)
Hi there, planetsurfur07,

This is planned, but not yet released. For details around this, see this older topic: http://getsatisfaction.com/livelabs/topics/linking_synths

In the mean time, though (depending on how much RAM your computer has, what the photos are looking at, and how many there are in total) you might be able to use the photos from both synths and just create a large single one on your computer. The calculations would have to be redone, but none of the photos that you have uploaded to Photosynth already will have to be re-uploaded.

I take it in your case that you want to link these two synths: 
Short Cave ( http://photosynth.net/view.aspx?cid=02303ba8-ddd3-4c38-953f-47e5b3b39584 )
Surrounding area of Short Cave ( http://photosynth.net/view.aspx?cid=1b330650-ab54-4d23-a07b-33a589827193 )

Have you tried the entire group as a single synth yet?
planetsurfur07 (Over 1 year ago)
Actually no, I have approximately 2600 photos that I would LIKE to get onto one synth but everytime I do anything above about 800 pictures photosynth runs out of memory. I guess it has to do with my RAM but i'm not for sure. I've seen other individual synths that had 3.4Gb of pictures and with my 2600 pictures it would be a little over 4Gb. Photosynth has a 20Gb memory space total per person. I dont understand why I cant upload something significantly smaller than that. I've even tried compression software to get the job done but that didnt work either (actually the compression software wasnt doing its job and still isnt)... I assume it's just the number of pictures that's making things rough.
Nathanael (Over 1 year ago)
ツ Yeah, when Photosynth runs out of memory when constructing a synth it isn't talking about running out of storage space on your Photosynth account; it's talking about running out of RAM on your computer.

2600 photos probably is asking a bit too much of today's 32-bit synther, though I have seen synths in the 1200 - 1600 photo range.

Changing the filesize of individual photos really isn't going to affect Photosynth's ability to put more photos together (as far as I know).
Nathanael (Over 1 year ago)
On the other hand, lowering the resolution of the images will make Photosynth find fewer details to match per image, resulting in fewer details to be matched across all the images, meaning that it won't take as much RAM to synth the same number of photos.

One thing to note is that although Photosynth currently uploads the full resolution images that it is given to be viewed, it only uses a 1.5 to 2 megapixel version of each image to actually perform the matching. You will need to lower the resolution of the input images to below this 1.5 megapixel resolution in order to expend less RAM. 

This is a less than ideal solution, however, because it means that viewing the photos will be a worse experience as they no longer have much resolution to zoom into.
Nathanael (Over 1 year ago)
One last detail that I should clarify is that if you decide to go the route of lowering the resolution of your images, they will be uploaded to the Photosynth servers since they are now fundamentally different files to the ones that were uploaded the first time.

Any edit to the local copies of photos that have been used in previous synths (even changing only the metadata) will cause them to be re-uploaded when they are used in in new synths because their checksum hash will no longer be the same. 

The only things that can change about a photo which will not result in it being uploaded a second time are its filename and its location on a hard drive.
Nathanael (Over 1 year ago)
As a side note, if you want your name to appear next to the licence shown in the lower left corner of the synth viewer, you'll need to add your name to your photos' 'Author' metadata field in program like Windows Live Photo Gallery before you synth them.  

If you think you might use the photo in multiple synths and having your name be displayed next to the Copyright notice or Creative Commons license is important to you, then it's a good practice to do this right when you take the photos off of their camera, so that no matter where you upload the photo, it will have your name in its metadata to help you prove that it's yours. 

If you don't apply this metadata when you first take the photos off of the camera, then you risk synthing them the first time without your name, remembering, tagging your photos, and having to not only re-synth but re-upload all the same photos which will use more of your time and more of your Photosynth account's hard drive space.
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