Why the cut contour gets its own plate

Here is a job that used to come back. A sheet of stickers, die cut to shape. The designer draws the outline in black, sends the PDF, and somewhere downstream a person has to work out that one of those black lines is not meant to be printed at all.

Sometimes they work it out. Sometimes the sheet arrives with the cut line printed on it, and the whole run is scrap.

The fix is not a better email

The cut contour is not a colour. It is an instruction to a machine, and the format has a place for it: a spot channel, named, set to overprint, on its own separation. Put it there and no human has to interpret anything.

That is the shape of almost everything in the print engine. Spot colours stay spot colours. Overprint is a property, not a hope. Ink limits are honoured rather than approximated. ICC profiles are applied rather than mentioned.

Every one of these is boring, and every one of them is a job that does not come back.

Why it lives in the browser

Because the alternative is a workstation, a licence and a person who knows where the export presets are. The work does not need any of that. It needs the file to be right.

So the engine is ours, it runs where the drawing happens, and what leaves the export dialog is a production file rather than a hopeful one.