No glasses, no headset. Cross your eyes until the two images drift
together into a third one in the middle — let that center image sharpen, and it pops into 3-D.
Smaller is easier: shrink it with the slider if it won't fuse.
Preparing the cross-eye view…
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Hold your screen at a comfortable arm's length.
Cross your eyes slightly — as if looking at your nose — until a third image forms between the two.
Relax and let that middle image come into focus. That one is the 3-D photo.
If it won't merge, make the image smaller with the slider and try again.