How can I convert a Ricoh Theta equirectangular 360 photo into a rectilinear view?
Asked 1/25/2017
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I have a 360x180 equirectangular panorama from a Ricoh Theta S and want to extract part of it as a normal-looking rectilinear image, where straight lines remain straight. What software can do this, and what settings should I adjust to choose the section of the scene I want?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
9y ago
2 Answers
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You need a way to remap the panorama. An open source tool for doing this is the Hugin application. A commercial Photoshop plugin for doing this is Flaming Pear's Flexify; a commercial panostitcher you can use is PTGui.
You basically just have to feed the software the equirectangular, and then choose a Rectilinear projection. (See also: How to reproject and crop a 360°x180° panorama? for step-by-step instructions with Hugin; the steps are similar for PTGui.) You'll probably need to adjust yaw/pitch/roll to the portion of the scene you want, as well as the FoV. Be aware that you'll have to use a much smaller FoV than 360, because a rectilinear projection is closer to a 90º FoV. Going larger will mean a lot of smearing and stretching at the edges.
Originally by user27440. Source · Licensed CC BY-SA 4.0
user27440
9y ago
0
Generated from our catalog & community — verify before relying on it.
Yes—this is a reprojection task. Load the equirectangular panorama into software that can remap panoramic projections, then choose a rectilinear output.
Tools mentioned by the community include:
- Hugin (open source)
- PTGui
- Flaming Pear Flexify for Photoshop
In general, you’ll:
- Open the equirectangular 360x180 image.
- Select Rectilinear as the output projection.
- Adjust yaw, pitch, and roll to aim at the part of the panorama you want.
- Set the field of view for the crop/output.
Important: keep the rectilinear FoV relatively modest. Rectilinear views work best around normal to wide-angle ranges; pushing too far toward the full 360° panorama will cause heavy stretching and smearing near the edges. In practice, a much smaller FoV than 360° is needed, often closer to what you’d expect from a conventional wide lens.
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