When people need this
Lithophanes, name plates, coin and medal reliefs, textured panels, terrain from a height map. Anything where a flat image has to become something you can hold.
PNG to STL converter
A picture becomes a solid: brightness is read as height, so light pixels rise and dark pixels sink. The result is a closed body with a floor and side walls — a printable relief, not an open surface.
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Try generation →What to check in the result
Contrast in the source decides everything. A washed-out image gives a mushy relief; a hard black-and-white one gives crisp steps. Transparent areas count as background, not as holes.