biggest project to date…

[chupathingie]

…and I’m hoping I have the horsepower for it. I went nuts on some pano data early this week and took a series of 144 bracketed shots to combine and stitch. After converting to tiff, it’s 17+gig of image data. If I can pull this off, there’s gonna be one very large image of Palo Duro to wander around and get lost in.

I’ve been toying with trying to shop a buyer for this, it’s going to be big enough to cover a wall… I’m estimating that at 150dpi the final would print at roughly 7′ X 30′. I have no clue how to go about it.

[ravnostic]

How much RAM you got? You might have to do it in slices, designed to be imprinted on wallpaper strips. Elsewise, you’ll need less resolution or a really nice CRAY

[chupathingie]

Currently I’ve got 16gig of RAM, and I’ve combined and reduced my data down to just shy of 6gig. I don’t know how much overhead my stitcher needs, but I’m expecting (and dreading) getting into swap. I may get close to the gigapixel mark on this one, depending on how much overlap I have between rows. As far as the mechanics of printing something that large goes, it would have to be done in strips. The widest roll of print paper I’ve seen in the local print shops is 36″.

[staplermofo]

Could you stitch it in strips too, so you’re only in swap for the last stitch or two?

taylorphoto.com offers gigantic prints mounted on rollable lexan for easy shipping. Also, motherfucking lexan, so you could say “Yeah, the pen might be mightier than the sword, but my motherfucking lexan photograph is a god damn bullet-proof, 7-foot castle, so kiss my ass!” Then the author and swordsman would cry but you’d be dry because lexan is waterproof.

[orionid]

How much RAM you got? You might have to do it in slices, designed to be imprinted on wallpaper strips. Elsewise, you’ll need less resolution or a really nice CRAY

Cray? Seriously? My laptop has more computing power than those antiques. It’s all about distributed processing now.

[ravnostic]

How much RAM you got? You might have to do it in slices, designed to be imprinted on wallpaper strips. Elsewise, you’ll need less resolution or a really nice CRAY

Cray? Seriously? My laptop has more computing power than those antiques. It’s all about distributed processing now.

Do they not have more modern CRAYs? I thought they did, keeping up with the Jones’es, so to speak.

[staplermofo]

Cray still has 3 computers in the top 10 on the world’s fastest computer list, but they’re all just piles of opterons or xeons.
There are still a few sparcs on the top 100 though.
USA! USA! USA!

[chupathingie]

PC was still crunching when I left for work this morning, and it looks like the final pixel count is about 1.3gigapixels. Apparently Hugin’s has been updated to handle larger files without running out of RAM, as my memory usage is still hovering around 3gig… it used to climb rapidly at startup as it loaded up the images for stitching. I’ll reserve judgement til after it’s done.

Aaaannnndd… my FOV at 200mm is 10.5 degrees, with shots every 10 degrees. You see where this is going, right? I have 2 vertical disconnects in my image set. Dammit. 2 vertical black stripes in the preview where I didn’t set the cams position exactly right. I went ahead and ran the stitcher anyway, so I could at least proof being able to do such a large image. I gotta say, Hugin impresses me. I reduced 144 bracketed to 48 fused images in 48-bit color, then simply dumped all of them in one shot into Hugin. Aside from my acquisition errors, the alignment went completely without a hitch, even with 4 rows of 12 images. It sorted and aligned them without any manual intervention whatsoever. Final rez is about 65000×20000 after cropping.

[chupathingie]

taylorphoto.com offers gigantic prints mounted on rollable lexan for easy shipping.

THAT is an excellent piece of info, and sounds like a great solution for x-large prints. At the rez I’ve got, 150dpi works out to be like 11ft by 36ft, so more than enough rez for a wall-sized mural.

[chupathingie]

w00T! It worked! It took 10 hours, but I’ve got a pair of 5.3GB images and one high-bit-depth 10.6GB image.

Now I have an unexpected snag…nothing I have can read them. GIMP’s tiff plugin crashes, RawTherapee just ignores it… I may give Graphics Magick a try, they claim to be able to open and manipulate multiple-GB images.

[chupathingie]

ok, might as well show off my mistakes… inaccurate camera aiming between shots, somehow I managed to get different exposure settings on the subs in the upper right, I boned my settings in enfuse and wound up with that god-awful halo where land meets sky and I neglected to clean my glass before the shoot (that one’s inexcusable). Once I saw my aim was off on 2 sets of subs I gave up trying to correct the image and just wanted to proof the process for a gigapixel image.

Larger here@90megapixels…biggest I could squeeze on flickr. Still a lot of detail, but only 7% of the original pixel count.

[Yugoboy]

Dude… that’s pretty sweet!

That halo disappears at the 90mpx size, so I wouldn’t stress that as much as the dust on the lens and the exposure change in the left 1/4. The gaps… oh well.

I would call this a successful “proof-of-concept” experiment.
Can’t wait to see the next one!

[Barracuda]

If that’s the proof of concept, I’m really looking forward to seeing what you turn out as a polished attempt.

[nobigdeal]

That’s pretty insane.

[Yoyo]

Ok, I assume you’re shooting on manual exposure so things don’t get screwey from one frame to the next, but what do you do about focus?

[Author]

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