>I have just noticed that Adobe Acrobat and the (unnamed) pdf viewer currently opening from Firefox on this machine render coloured files very differently. It's not just that the tones are different, but, for example, in Acrobat boulders and the passage containing them are the same shade. In the other viewer the boulders render a darker tone than the remainder of the passage. Same goes for calcite flows, though not, seemingly, for sand.
Yes, see this page http://therion.speleo.sk/wiki/doku.php/contrib:externalviewers#examples_of_r endering_differences_between_pdf_viewers and the commentary above it. Bruce
