Planet Subaru Revisited


My last attempt at stitching the panorama of the inside of a Subaru Impreza resulted in something less than stellar – interesting, but if you look closely, you can see the stitching errors. I was stumped, especially given that the pan head was set so the photos were good, and according to the information I had at the time, I was using PTGui correctly. PTGui is the stitching program that I use. Everything seemed simple – import the images, align them to create the larger image, and that’s it. I’ve yet to get a single decent image with that method, so I turned to reading tutorials and wound up watching YouTube video tutorials. It turns out, everything comes down to the setup before you tell the program to do anything. Armed with a little more info, I set out to try again. First, I imported my images…


After telling the program that I used an 8mm fisheye lens, I set my desired result to a 360 degree by 180 degree panorama, then clicked into image parameters. It simplifies the process to tell the program where the photos go so that it can better find points in common – by entering in the angles at which I took the photos (0,60,120,180,240,300) as well as designating the up and down photos, I watched the photos move into position on the thumbnails…

Recently added to PTGui is the masking feature so that you don’t have to make separate alpha channels in Photoshop. I added masks to the photos to tell it to ignore certain areas of photos or to prioritize certain areas, and finally generated control points. Areas in red are ignored, areas in green are priority.


With a few minor tweaks and a quick cleanup in Photoshop, the image at the top of this post is the result. How does it compare to the first one? See a few of the closeups below…

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