The poster made of tiny photos that taught a machine to see edges
I’m at a long table with a handful of small photo prints, trying to build one huge wall poster. Some prints overlap, some look a bit stretched. The worst bit is tracing the hair-thin line where two similar shapes touch, so the poster doesn’t turn them into one blob.
I’ve only got a small stack of prints that someone has already labelled with care. There isn’t much to copy from. That’s like those cloudy medical pictures of cells: marking every tiny edge takes ages, so older computer tools often smudge the fine borders, especially where cells press together.
Then I change how I work. I step back to place the big shapes, then lean in to redraw the edges. The new computer setup copies that: one part shrinks the picture to grab the whole scene, another part builds the outline back up. The twist is it passes sharp notes straight across, so the edge-drawing bit doesn’t have to guess.
On the wall, I hold two facts at once: where a shape sits in the big layout, and the crisp clue of its exact edge on a single print. The computer does the same by keeping the wide view linked to earlier, sharper details. Takeaway: a blurry overview can’t draw clean borders, and close-up edges alone can’t place things properly.
When the picture is too big, I work in overlapping patches and stitch the traced bits together. If a patch hits the edge, I flip a print to fake extra margin so nothing looks chopped off. With too few labelled prints, I practise on believable warped copies, so small bends in real tissue don’t throw the tracing off.
There’s one spot I treat like it’s made of glass: the narrow gap between two touching shapes. I press a thicker marker there, because one slip ruins everything. The computer gets the same nudge by being told, in effect, to care extra about those thin borders, so it stops merging neighbours into one.
When I step back, the poster has the right big layout and the clean, thin boundaries that keep shapes separate. That’s what this design aims for too: one smooth setup that keeps context and detail tied together, stitches big pictures from overlaps, and copes with few labels by practising on warped versions while watching borders like a hawk.