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by Aditya

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It's not something i am planning on doing often but I wanted to try to do a panorama and use Photoshop's "Merge to Panorama" feature to stitch the images. Previously I have only done this manually. I think I have a decent overlap in my images but Photoshop is unable to stitch my images. I have 2 sets of images and it stitches the middle group fine but not the first and the last image. This is similar with my other group of images where it stitches 2 middle groups and not the first and the last image. Below is a screen capture of what i usually get:

What am I doing wrong?

enter image description here

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I'd agree with Stan Rogers answer. But have you tried other software like Autopano Giga or even with this image trying to put the images that didn't stitch in manually by extending the canvas and pasting in the other images. I know its manual but judging by the simplicity of this image you might get away with it. –  Rob Sep 18 '11 at 8:03
    
Honestly, I am surprised you got this far. I am assuming the body of water is not frozen and you have a great amount of variation between shots and very little features for the stitching algorithm to work with. Since it's free, try Autostitch: cs.bath.ac.uk/brown/autostitch/autostitch.html –  Itai Sep 18 '11 at 14:05
    
I also had exactly the same thing happen in CS6 in the last month. Similiar images same exact results using the same settings, tripod and overlap, etc. I will force the first and last images together. –  user15648 Jan 17 '13 at 17:51
    
I have started having this problem after successfully stitching for a couple of years. I think it might be a CS6 bug. I am downlaoding the CC version of PS now. Also going to try exporting to DNG to see if it is an EXIF problem. Out of curiosity, what camera are you shooting with? I am wondering if it could be a problem with CS6 and the 5D Mark III EXIF? It is probably the final push I need to purchase PT GUI. –  user21667 Aug 18 '13 at 14:36

2 Answers 2

up vote 5 down vote accepted

The framing of the first and last images seems to be significantly different from the others (it took a while for me to see that the top pic was the last and the bottom the first, assuming left-to-right sequence). There may simply be too much ambiguity for Photoshop to deal with in this particular sequence, since the main differentiator is colour (something PS autocorrects to a degree in stitching), with the darkness of the islands and clouds being the "anchor", and both of the pics left out have the horizon in a significantly different place than their next-door neighbors.

I don't know how the panoramic merge works in PS these days (I'm still running CS3), but this looks to me like one of those instances where manual tiling would be necessary, and I'd expect to lose (or have to synthesize) a significant part of the vertical after the stitching because of the framing issue.

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+1 Stan, @Jakub once you mark images for merge you go through image order where you can re-order. Please see this video from Adobe adobe.com/designcenter/video_workshop/?id=vid0013 –  peter_budo Sep 18 '11 at 8:09
    
Thanks guys. Too much ambiguity is likely the problem here. The images are ordered sequentially correctly. In the capture above Photoshop ignored the first and last image then put the last first and the first last. All images were taken on a tripod with the same ISO, aperture and focal length. Not sure about white balance though. I might have accidentally left that on auto which might have contributed to the problem. –  Jakub Sep 18 '11 at 16:20

Automatic stitching is not perfect, it works by identifying a set of salient image features, corners, junctions, dots, lines etc. and then searching for a transformation that causes a good number of features to match up with the feature set of an adjacent image.

In your case there are simply not enough features in the two unmatched images. The top image contains a large amount of featureless sky. In the bottom image, all the features are concentrated in the shoreline area - which isn't present in any of the other images, and the water is devoid of the dark ripples that I'm guessing provided the features to match the middle images.

You haven't really done anything wrong, it's just your chosen subject doesn't contain enough detail. If I were you I'd try and add the spare images manually, and try and bear in mind the need for distinguishable features when shooting panos.

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Yes. The lack of features seems to be the culprit. I have just tried a another panorama from a hilltop and everything merged perfectly. I would think though that Photoshop would take the sequential number of images into consideration when merging and at least make an attempt. –  Jakub Sep 18 '11 at 16:12

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