My brother and I loved our Viewmaster when we were kids (I've still got it). Decades later, I bought a lovely stereoview slide of the victorian Cliff House for my San Franciscana collection. Over time, I bought more San Francisco stereoview slides and wrote a SF stereoviews web page to display them. Much later, in early 2011, I realized I could make stereograms without a special camera from pairs of photos taken at slightly offset positions, provided the subject remains stationary. I wrote a program to construct stereograms: from a pair of photos and positioning data, it builds an anaglyph stereogram, a reversed stereogram, or a normal stereogram. It's simpler than you might think.

The Wikipedia stereoscopy article gives general information on stereo imaging. You can view paired images using a stereoscope, or you can combine left/right images into a single anaglyph image and view it using simple red/cyan glasses, or you can view paired images without using any device (freeviewing). There are two ways to freeview: place the images in normal left-right orientation and focus past the image (wall-eyed or parallel viewing), or place the images in reversed right-left orientation and focus in front of the image (crosseyed viewing). Freeviewing is nicely described here, with simple illustrations and good viewing advice; I won't repeat it here.

This page shows a few of my stereograms, as both anaglyph (red/cyan) and reversed (crosseyed) images. I find reversed freeviewing more natural than parallel freeviewing, so I typically do not bother to generate parallel image pairs.

Click on any image to enlarge, then use the back arrow on your browser to return.

To start a slideshow, click here for anaglyph images or here for crosseyed images.

Anaglyph Description Location Date Crosseyed
a02.png Orchid San Francisco 2/04/11 r02.png
a05.png Back yard San Francisco 2/04/11 r05.png
a13.png Driveway Arnold 2/04/11 r13.png
a03.png Sawyer Camp Trail
Crystal Springs Reservoir
San Mateo 2/13/11 r03.png
a05.png Crystal Springs Reservoir San Mateo 2/13/11 r05.png
a30.png City Hall San Francisco 2/13/11 r30.png
a07.png Ol' Beth
Angels Camp Museum
Angels Camp 12/17/11 r07.png
a37.png Carriage
Angels Camp Museum
Angels Camp 12/17/11 r37.png
a47.png Water wheel
Angels Camp Museum
Angels Camp 12/17/11 r47.png
a71.png Mining & ranching building
Angels Camp Museum
Angels Camp 12/17/11 r71.png
a09.png Cacti Davenport 1/07/12 r09.png
a172.png Pumpkin at Matt's Stanford 10/31/12 r172.png
a190.png Pumpkin at Matt's Stanford 10/31/12 r190.png
a022.png Rip Van Winkle Gardens Jefferson Island, LA 2/19/13 r022.png
a33.png Kate Shepard House Mobile, AL 2/21/13 r33.png
a044.png Newtown Creek
Brooklyn, NY 12/01/13 r044.png
a62.png Armajani: Whitney Bridge Minneapolis 7/24/14 r62.png
a75.png Armajani: Whitney Bridge Minneapolis 7/24/14 r75.png