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The first is that pigments don’t have the colour gamut, or colour range, of dye inks - images can look very flat. Pigmented inks also have much bigger particles than dye inks so with glossy papers dark areas have a curious, and unattractive, metallic appearance called chroming, which means pigment inks are best on matt or satin papers. Lastly existing pigmented inks are badly effected by metamerism which means that the colour of the ink changes depending on the type of light it’s viewed under. You may make the perfect print one evening under daylight corrected flourescent tubes only to find that viewed in real daylight the next day your print has a horrible cyan colour cast. Take it back under the flourescents and it’ll look great again. Epson have worked hard at reducing this problem since the 2000P but it’s still there.
The side effect of pigment inks that the R800 and R1800 do try to address is chroming on glossy papers. Both printers use an extra Gloss Optimizer cartridge to give prints on glossy paper an even sheen - even in the darker areas. It works up to a point. Prints look OK but not really like Canon glossy prints or conventional glossy photographs from an online lab..
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