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Before Google Cardboard come to the idea of replacing expensive glasses which filtered quickly-alternating images (or low-cost glasses which filtered different color images) with simply one static image for each eye, that method was used widely on the decades that span between 1890 to 1940.

I wonder if there is some application to convert such old stereoscopic images (those postcards with one image for each eye, intended to be viewed with a special viewer) to cardboard. I guess that it should be simple, because you already have a different image for each eye and just need to change image centers to match those of Google Cardboard.

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Sure. Most any stereo viewer for Cardboard will take .JPS files. Just scan your postcard as a .JPG and change the extension to .JPS (meaning JPG Stereo)

Example viewer app: 3D/VR Stereo Photo Viewer https://play.google.com/store/apps/details?id=com.andymodla.apps.vrstereophotoviewer

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