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Assume I have a traditional panorama. I use a spherize technique (e.g., in Photoshop) to produce a spherical image. Some time later, I want to take the spherical image and get back the landscape (ideally via Photoshop).

Assume I don't have the .pst that was used to create it, only the spherical image file.

Any recommendations on a Photoshop step-by-step to achieve this? Thanks.

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  • \$\begingroup\$ By Spherize do you mean Photoshop Filter > Distortion > Spherize? or something else? I'm not sure what you mean by "traditional" panorama, either. Can you possibly post an example image? \$\endgroup\$
    – inkista
    May 29, 2016 at 21:28
  • \$\begingroup\$ Thanks. Yes, using the Spherize filter to produce a spherical image. Then I want to reverse that to turn the spherical image into a rectangular image. \$\endgroup\$
    – Tony
    May 30, 2016 at 2:19
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    \$\begingroup\$ This is a possible lesson on "Why you always work on a copy image".... \$\endgroup\$
    – Rincewind
    May 30, 2016 at 11:14
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    \$\begingroup\$ I voted to close because "the idea of "spherize" can refer to a a) spherical projection, b) little planet, c) ultra wide angle, d) or some other effect in photoshop. Post an example image please. \$\endgroup\$
    – Rafael
    May 30, 2016 at 13:46
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    \$\begingroup\$ It is a normal procedure. If a question is improved it can be re opened. That is when you find an "on hold" question. Yup, probably the button should say "on hold". \$\endgroup\$
    – Rafael
    May 31, 2016 at 1:40

2 Answers 2

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Pradeep Sekar was in the right direction but is probably using an old version of Photoshop.

Using Photoshop CC, here comes a step-by-step solution :

  1. Open your sphere image in Photoshop. Here an image from http://photography.tutsplus.com/articles/using-polar-coordinates-to-turn-landscapes-into-planets-and-more--photo-9998 as example :

Unsphere 1

  1. Go to Filter > Distort > Polar Coordinates

Unsphere 2

  1. Select Polar to Rectangular and check the preview.

Unsphere 3

  1. You are done. Some adjustments may be needed on the "borders" on your images.

Unsphere 4

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    \$\begingroup\$ If you're really brave :-), you can apply the polar-Cartesian transform with a couple lines of R or MATLAB. \$\endgroup\$ May 31, 2016 at 12:22
  • \$\begingroup\$ I just want to say that old version of PS wasn't the issue, anyone giving an answer different from this is just lack of experience. Polar Coordinates was one of the original filters. \$\endgroup\$ Jun 1, 2016 at 11:21
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This is just a theory and has not been tested so I wouldn't know how the output would be.

You try to invert the image 1st and then try the "Photoshop Filter > Distortion > Spherize".

Do submit the results here

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  • \$\begingroup\$ Invert in what way? \$\endgroup\$
    – mattdm
    May 30, 2016 at 16:35
  • \$\begingroup\$ @mattdm : I'm pretty sure pradeep sekar means invert up/down (inverting up/down is a step toward making a polar panorama from a landscape image). I don't see how the Distortion > Spherize will help, its goal is to create a spherized image... BTW, 30s later, I tested it => not working :) Link to create a sphere image : photography.tutsplus.com/articles/… \$\endgroup\$
    – Olivier
    May 30, 2016 at 19:17
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    \$\begingroup\$ Posting "guesses" or "theories" as answers is generally frowned upon. \$\endgroup\$ May 31, 2016 at 12:23

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