Stereoscope

With Stereoscope, there's no need to learn how to cross or relax your eyes.

# How to use Stereoscope

First, copy a stereograph, both side-by-side images together.
Second, open Stereoscope and press the “Load Parallel Image” or “Load Cross-Eye Image” button.

Most images are in the parallel (left-right) format, but if the image looks wrong, try the cross-eye (right-left) format.

If the image still doesn’t look right, adjust the crop and/or offset sliders at the bottom of the window.

Many historical and modern stereographs are available online. Try some of these images to start:

https://www.londonstereo.com/3-D-gallery1.html

The image shown in the screenshots above are in the public domain, from the Getty Museum's collection:
https://www.getty.edu/art/collection/search?object_type=Stereograph&open_content=true&images=true


# More info

1. Most modern stereographic images do not include frames, or use frames of equal width on both sides. These images can be copied directly from Safari on the Apple Vision Pro and then loaded successfully.

2. Older stereographs usually include a frame, and require adjustment of the Crop and Offset sliders. Note that if you’re accessing the images on your Mac, using Mac Virtual Display, the Preview app allows you to select and then copy any part of any image.

3. Please also note that not all stereo 3D images have been created in the same way, and some images simply may not look good. If an image looks strange or causes eye strain, try reloading with the other mode (Parallel or Cross-Eye).

4. Stereoscope is only a viewer, and nothing is ever saved. Stereoscope does not convert images into true Spatial format for viewing in the Photos or Files apps.