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.


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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