A pigment is a particulate, water-insoluble coloring material; ink particles remain on the paper surface. Because of the water insolubility, blurring can be reduced, even when wet.
Dye is a water-soluble coloring material; ink seeps into the paper together with the water contained in the ink. The ink leaves no roughness on the paper, and the print result will be more vivid than that using pigment ink.
Printing on gloss paper using pigment ink sometimes results in uneven glossiness due to the light dispersion caused by the varying height of the adhering ink. Chroma Optimizer, Canon’s own transparent ink, comes with PIXMA PRO-1 and PRO-10 and solves this problem. The ink helps provide uniform glossiness by evenly coating the surface of the print.
Pigment Ink
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Dye Ink
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Selecting the Clear coat the entire page checkbox in Print Studio Pro specifies Chroma Optimizer to be printed to make the entire paper surface even, including non-colored paper areas.