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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!

marked as duplicate by inkista, scottbb, Community Jan 31 '17 at 23:29

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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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