The new 3D objects use real greyscale depth maps, not flat silhouettes.
Medium detail: balanced for greeting cards.
Larger keeps the illustrations recognisable. The stereogram repeat spacing is preserved.
Tip: Select a sculpted 3D object or keep hidden text to one or two short words. To see it, relax your eyes and look through the image as if focusing beyond the screen.
Generating…
Viewing tip: On a phone, hold the image about 25–35 cm away, relax your focus and let neighbouring repeats merge. Larger screens or printed cards may be easier.