Developer eliminates alignment marks in tiled poster printing using grid-line cuts

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A developer building tiled printing for ArtGrid, a static web tool, devised a method to split large images across multiple A4 sheets without needing alignment marks or registration dots. Instead of cutting pages at fixed paper dimensions, the tool forces every page boundary to fall exactly on an existing grid line, so seams are invisible continuations of lines the user will draw anyway. The key calculation divides the printable area by the grid cell size to determine how many whole cells fit per page, rather than dividing by raw page dimensions. This approach works only because ArtGrid enforces square cells of uniform size, a constraint originally chosen for drawing accuracy that incidentally made seamless tiling possible. The developer verified correctness by asserting that the summed widths of all tiles in a row match the original enlarged drawing rectangle to within 0.01 mm.

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