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I would like to extract a portion of an equirectangular 360x180 panorama taken with a Theta S and convert it to what I think is a rectilinear image (a picture where straight lines are shown as such regardless of the lines' direction). Could you please advise on how to do it? Thanks in advance!

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  • \$\begingroup\$ @StephenG broken link - 404 error \$\endgroup\$
    – Manly
    Jan 26, 2017 at 15:33
  • \$\begingroup\$ Trying again with the link to Hugin \$\endgroup\$ Jan 26, 2017 at 16:33
  • \$\begingroup\$ You can use libgnomonic by Foxel SA. \$\endgroup\$
    – Kozuch
    Sep 30, 2017 at 19:28

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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.

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