One of the printers at Drukkerij Slinger (printing company) in Alkmaar  tests a proofing print of my upcoming book for accurate colors. My pictures and the design of the book were done in -normal- Adobe RGB colorspace, but before the print run is done, the whole thing must be converted to the colorspace that is both a combination of the paper and inks that are used in the book. Actually, this is done before printing the thing, but further adjusting the colors at press-time takes a while and eats up hundreds of pages that are thrown away.