Spot Color Separation Studio

Turn a design into press-ready spot color separations: the tool clusters the artwork into a LAB color palette, maps each color to an ink channel, builds a choked white underbase and a highlight white for dark garments, previews the print stack on a shirt color — then exports every plate as film-positive PNG and 1-bit EPS with registration marks. Everything runs in your browser; your artwork never leaves your computer.

How to use it

1. Open your artwork — flat-color designs and logos separate perfectly; photos come out posterized (that's the nature of spot color, not a bug).
2. Set the number of colors with the slider and re-extract if needed. Each extracted color becomes one ink plate, ordered light → dark (print order).
3. Assign inks in the plate list: rename each plate, set the actual ink color with the color picker, or untick plates you don't want to print (e.g. the background paper color).
4. Fix strays — click any mis-assigned region on the canvas to flood-move it to the active plate; use the brush for detail work. Ctrl/Cmd+Z undoes (40 steps).
5. Dark garments: enable the white underbase, add a 1–3 px choke so colors don't overhang the white, and enable highlight white to make bright areas pop.
6. Preview on your shirt color, then export all plates as film positives (PNG, coverage → black) and 1-bit EPS with registration marks and plate names.

All computation happens locally in your browser — nothing is uploaded. Settings (color count, underbase, thresholds) are remembered in this browser only. A detailed walkthrough with the concepts explained lives in the guide: How to Separate Colors for Screen Printing.