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DPChallenge Forums >> Individual Photograph Discussion >> My 16.9 megapixel image
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Showing posts 1 - 14 of 14, (reverse)
AuthorThread
 01/24/2005 09:56:55 AM · #1
This is a 5 image stitch of an old building (boathouse?) by a small creek in Slidell, LA (near New Orleans). I used a program called PTAssembler to stitch the images. The lens used was the EF 50mm f/1.4. The full size image is 16.9 megapixels!



Here is a 100% crop of the full image.



Comments/criticisms welcome.

Chad
 01/24/2005 10:07:25 AM · #2
Wow! That's a really great shot --- superb quality! Oh man... if you had a person dangling their feet in the water or something for some scale that would be phenomenal. Great experimentation though and awesome product.

Lee
 01/24/2005 10:10:12 AM · #3
Excellent shot! I've never tried that, at least since I learned how to use my camera. Maybe I should...
 01/24/2005 10:47:12 AM · #4
Excellent work! Beautiful photo!

Everytime I try stitching, you can see all the seems. I use the Canon stitch software (free). It NEVER works. It usually squishes my landscapes on the vertical too. I have no idea what i am doing wrong, but I am impressed what you did with yours!!!
 01/24/2005 10:50:56 AM · #5
Thanks for all the nice comments.

PTAssembler is very powerful, but it has quite a learning curve. And it is just a user interface for a program called Panorama Tools, which is script driven. Panorama Tools is free, but PTAssembler costs a little ($40, I think).

Even on the full image, looking where I know there should be seams, I cannot see any hint of a seam. Very impressive.

Chad

Message edited by author 2005-01-24 12:47:31.
 01/24/2005 12:13:10 PM · #6
Very nice image. BTW, there are quite a few panorama stitching tools out there now, although some of them are just front ends for panotools (like PTAssember). Check out www.panoguide.com for a list.

Mirdonamy, I've had good succes with Canon's stitching software (most of the panoramas in my portfolio) are done that way). Maybe you need to manually set the focal length for your lens?
01/24/2005 12:40:55 PM · #7
Originally posted by magnus:
Very nice image. BTW, there are quite a few panorama stitching tools out there now, although some of them are just front ends for panotools (like PTAssember). Check out www.panoguide.com for a list.

Mirdonamy, I've had good succes with Canon's stitching software (most of the panoramas in my portfolio) are done that way). Maybe you need to manually set the focal length for your lens?


What do you mean manually set the focal length? I just focus, keep the tv & av constant (same settings the whole way), and snap like 5 shots, left to right, overlapping by 1/3. The software puts them together well, but you can see every seam. It also squishes the image. What should be tall sky scrapers look like short fat buildings. I tried quite a few times. I did some comparisons when looking at the photos in photoshop and there's a HUGE error in the squish factor (as in, there shouldn't even be a squish factor).

Maybe i'll reinstall.
 01/24/2005 01:36:54 PM · #8
Chad, wonderful image. I love images like this and you did a great job with it. It's a great way to get medium or large format quality out of your camera. This looks like a great candidate for black and white too.

Tim
 01/24/2005 01:46:52 PM · #9
Originally posted by mirdonamy:
Originally posted by magnus:
Very nice image. BTW, there are quite a few panorama stitching tools out there now, although some of them are just front ends for panotools (like PTAssember). Check out www.panoguide.com for a list.

Mirdonamy, I've had good succes with Canon's stitching software (most of the panoramas in my portfolio) are done that way). Maybe you need to manually set the focal length for your lens?


What do you mean manually set the focal length? I just focus, keep the tv & av constant (same settings the whole way), and snap like 5 shots, left to right, overlapping by 1/3. The software puts them together well, but you can see every seam. It also squishes the image. What should be tall sky scrapers look like short fat buildings. I tried quite a few times. I did some comparisons when looking at the photos in photoshop and there's a HUGE error in the squish factor (as in, there shouldn't even be a squish factor).

Maybe i'll reinstall.


I meant to specify the focal length in the Merge Settings in PhotoStitch. I once had a problem like what you describe, but now I can't recreate it. Photostitch seems to read the focal length from the header of image files from Canon cameras, I think my problem was specific to images that came from a different camera, but I solved it by manually specifying the focal length in PhotoStitch.
01/24/2005 02:00:51 PM · #10
I'll have to try that! I wonder if it couldn't read the header since I renamed the photos. Doesn't seem likely though.
 01/27/2005 09:30:16 AM · #11
For those who might be interested, a print is now available HERE.

Thanks for all the great comments.

Chad
 01/27/2005 12:35:27 PM · #12
Good job! I've done something in this vein last year, using 3 rows of 12-15 images. My zeal created a hole, which did not, thankfully, prevent me from achieving my goals. The final image is approximately 140M and sits on disk as a 2G compressed 16-bit tiff.

I have yet to find a stitching program that could assemble all 37 images together so I had to PT-generate individual tiffs. The memory requirements were too much for Photoshop (and PS memory management is notoriously ancient and broken anyway) so I could only work with pairs of images before having to shut it down and restart with a new pair (to-be-assembled image plus new image). Each seam was manually massaged for pixel perfect presentation.

There's a hole in my mountain, dear Liza:


100% detail (of green square):
01/27/2005 12:58:56 PM · #13
Excellent job, dwoolridge. Have you taken a look at PTAssembler? From what I can tell, there is no limit to the # of shots. You are only limited by your patience in picking the control points on the adjacent shots. Also, you are only matching 2 shots at a time, so there will be no memory problems. But, considering it took my 1.33GHz machine 5 or more minutes to stitch my relatively small image, you may have quite a wait with your monster.

I had originally taken 16 images to stitch, but I screwed up on some of them, rendering them useless. Therefore, I had to manage with just 5 shots.

Chad
 01/27/2005 01:25:18 PM · #14
Originally posted by cpurser:
Have you taken a look at PTAssembler? From what I can tell, there is no limit to the # of shots. You are only limited by your patience in picking the control points on the adjacent shots. Also, you are only matching 2 shots at a time, so there will be no memory problems.

Yes, I've tried a great many of them. MR on LL recently gave a favourable review to some commercial stitching software, but it too choked. The issue is not in creating control points, but in the generation of the final image. I still used the software (Hugin if I recall correctly), but I could not create the final image with it (or any other software, including PTA) barfing as it ran out of memory; I had the software output individual tiffs. There used to be a time that software was written to run under the worst of resource restrictions; Moore's so-called Law has spoiled us.

Message edited by author 2005-01-27 13:27:12.
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