Sorry, accidentally sent from wrong email address!
On 8/22/23 12:05, david wrote:
Replies interspersed below.
On 8/21/23 16:36, dgjohnston wrote:
Greg, thanks for the additional information. The images in this set
are well suited to the quick run though using the Fast Pano Preview
because of the randomness of the rocks, trees, and water. It’s hard
to detect any minor discrepancies like one would with images of
manmade structures. With those the iterative process that David
covered works well to get the best alignment.
I don’t know why David’s version of Hugin wasn’t able to find
connections between so many images. He used 2022.0 and I’m using
2022.1 (listed as pre-release).
My Hugin found a lot of connections between images. The manual process
I use cleans a lot of control points out along the way, as positions,
yaw/pitch/roll, and barrel distortion are calculated. When I redid the
image using the drag-and-drop images and told it to not make any image
stacks, the Align button produced a fine panorama.
From other emails, I think 2022.0 found just as many control points as
2022.1 and 2018.0.
1. Another reason that Hugin might be coming up with the “image
stacks” is the difference in shutter speed of the images … they run
from 1/125 s to 1/500 s (but I don’t know what Hugin is basing its
decision on).
Stanley … I’ve seen many suggestions that pano images be taken in
manual mode with the settings base on the brightest part of the
image. Also, keeping the white balance fixed might help the colour
tinting that shows up.
I have no idea how Hugin identifies image stacks, either. I shoot
frames with the camera set to aperture priority, so shutter speeds can
be all over the place. Hugin doesn't seem to identify image stacks in
my frame sets, but I haven't tried any using drag-and-drop.
Similarly, color balance can be all over the place, too. I used to try
to adjust that when developing the raw files, then decided it wasn't
worth the effort.
Sometimes, if I use Autoexposure setting in the program I use to
develop RAW images, color balance can come out weird, but if I reset
the exposure setting (turn off autoexposure in the program), colors
come out better.
2. After Align, I get a mean error of 5.5 pix with max 38.6.
I received the same colour tint issues that showed in David’s
stitched image. The top-right corner has a green tinge.
Don J.
On Aug 21, 2023, at 6:27 PM, Greg 'groggy' Lehey
<[email protected]> wrote:
On Sunday, 20 August 2023 at 6:34:23 -0400, Stanley Green wrote:
If the link is still active, you can try to get the images directly:
https://wetransfer.com/downloads/c5b1b40878f4f80c5b68af6a6767392b20230817102250/51d164ee951b6c084af7ed1d0d27730e20230817102250/2ee2fd
Thanks for that.
I'm confused. A week ago I wrote:
On Tuesday, 15 August 2023 at 11:02:08 +1000, Greg 'groggy' Lehey
wrote:
My suggestion: use the Align tab on the Fast Panorama Preview.
Specifically,
1. Load the files from the "Load Images" tab in the Fast Panorama
Preview.
2. Select "Align" from the Fast Panorama Preview.
3. Select "Create Panorama" from the Fast Panorama Preview.
And that's all.
In a little more detail for this specific panorama:
1. Loading the files produced the popup
Hugin has image stacks detected in the added images and will
assign corresponding stack numbers to the images. Should the
position of images in each stack be linked?
That's incorrect. There are no image stacks here, so you should
answer No. I've almost never seen this message, and I suspect it
comes here because of the overlap between images. 30% should be
enough. This will give you fewer images and will greatly reduce
the stitching time.
I shoot 50% overlap generally.
2. Aligning the images gave me an image with mean error 3.8 pixels,
maximum 28.4. Potentially you could improve on this with more
attention to the position of the entrance pupil, but part of it
will be due to the water, which doesn't stay the same from one
image to the next. You could tune the control points, but in this
case I don't think you need to: I don't see any inconsistencies in
the finished panorama.
3. "Create Panorama" offers you a choice of stitching options,
defaulting to "exposure corrected, low dynamic range". That's the
one.
But that's all. In particular, I don't understand the problems that
David W. Jones had, but then I don't understand the complexity either.
I also didn't see the colour discrepancies that he mentions.
So: the final image is at
http://www.lemis.com/grog/photos/Photos.php?dirdate=20230817
I have also put the .pto file at
http://www.lemis.com/grog/Day/20230817/GF_6-panels_-3-Rows-0-GF_6-panels_-3-Rows-17.pto
This will not be directly applicable, because I have removed the
spaces from the file names you provided.
Click on the image up to three times to increase the size up to the
original (about 113 MP). Also let me know if you want this image
removed after we're done.
Greg
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