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File › Place with Link reads a DCS 1.0 or 2.0 file (an EPS file whose header names one EPS program per printing plate) as one linked image of its plates. Each spot plate adds a spot swatch in the CMYK values the file gives, and the clipping path the file's composite is drawn through clips the image. document.open, file.place without link or from bytes, and links.embed refuse a DCS file and change nothing. - The screen, composite print and exports show the plates mixed into CMYK. Separations Preview and print separations show each plate on its own ink; a spot plate prints as its CMYK values when spots print as process. - links.list answers the format DCS, and with dcsTransparency marks the DCS images that are transparent or overlap transparent objects (the Links panel menu's Show DCS Transparency Interactions). - swatch.unused leaves out a spot swatch while a DCS image has a plate of its ink. - links.update and links.relink read the plates and the clipping path again, and the link shows as modified when one of its plate files changes or is gone. - The plates go on the first plate's pixel grid, grown to hold every plate where it prints; a plate of another size or position is resampled onto it. - A file may name 64 plates, a plate file may be 1 GB, and the plates together may hold 512 MB of ink amounts. A file naming more plates is an error. Docs: docs/mcp.md, docs/target-app-parity.md, docs/file-format-parity.md.