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A Perceptual linear or radial gradient was always written as an image, so a gradient of spot ink tints lost its plate, and no warning named the spot ink. PDF export now writes a Perceptual gradient whose stops are tints of one spot color (and paper white) as a Separation shading in that ink. Its tints follow the gradient's curve: at each stop the renderer places on the curve, the tint with the OKLab lightness of the color there. Dithered fills, freeform gradients and Perceptual gradients that mix a spot color with other colors are still images, and the export now warns when such a gradient has stops linked to a spot swatch that its spot colors are written in process colors.