- A radial gradient from a spot swatch to a CMYK color is written as a
DeviceN shading (ShadingType 3) of Yellow and the spot ink.
- A Lab spot color used as a flat fill and in a mixed gradient is
written as one Separation space with the Lab alternate, which the
DeviceN space names under /Colorants.
- docs/roadmap.md lists the gradients that still export without the
spot ink: mixed spot/process gradients in SVG and PDF gradients with
RGB or Lab stops. docs/target-app-parity.md also notes that a
Perceptual gradient is written to PDF as an image.
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