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Photo lithophanes — a portrait or landscape turned into a backlit panel — are by far the most common use. Also engraved photo plaques and keepsakes.
JPG to STL converter
The same relief mechanism as PNG, aimed at photographs. JPEG compression leaves faint blocky noise that would show up as ripples across the surface, so it is smoothed before the height map is built.
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Photographs rarely have the contrast a relief needs. Convert to greyscale and push the contrast before converting, and the printed result reads far better.