on 17/11/04 11:59 am, matthew ward wrote: > > On 17 Nov 2004, at 11:09, Martin Orpen wrote: > >> Which suggests that Photoshop can't even convert neutral gray from 16 >> to 8 >> bit without introducing errors (or noise) into an image. > > I doubt if it is photoshop, its maths, when you go from 65000 levels of > precision to 256 levels of precision you are going to get a rounding > error.
Well, I'm not so sure :-) Wouldn't you sometimes get non-neutral pixels from rounding errors? And if you look at the latest images that the script has generated: <http://prometheus.idea-digital.com/phpbb2/viewtopic.php?t=301> You'll see why I'm a bit suspicious. Why do all the incorrect pixels round to darker values until you get to R239 G239 B239? Why do you get progressively fewer errors as the RGB values decrease? Regards -- Martin Orpen Idea Digital Imaging Ltd -- The Image Specialists http://www.idea-digital.com =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
