Archived posting to the Leica Users Group, 2003/02/11
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]B.D. I use 16 bit to darken the corners of many of my images. In 8 bit I will get quite severe banding in smooth toned areas such as sky. When I use 16 bit this does not happen, but it does slow down the work. Regards, Rob bdcolen wrote: > I don't know, Austin - I work with 8 bit files, I do lots of correction, > and I don't get posterization... > > -----Original Message----- > From: owner-leica-users@mejac.palo-alto.ca.us > [mailto:owner-leica-users@mejac.palo-alto.ca.us] On Behalf Of Austin > Franklin > Sent: Sunday, February 09, 2003 12:43 PM > To: leica-users@mejac.palo-alto.ca.us > Subject: RE: [Leica] 8 bit vs. 16 bit B&W files > > Richard, > > > Can you obtain good B&W prints working with 8 bit files compared to 16 > > > bit files? > > It depends on what you mean by "working with". If you do any tonal > corrections (aside from very very very minor ones) with 8 bit data, you > will get posterization. If you want to work with 8 bit files, get the > tonality correct in the scanner driver (which means it is done using > high bit data). Do you know what is meant by "tonal corrections" as > opposed to changes that do not change the tonal curve? > > > If > > I use the Epson 2200 printer, am I limiting the output quality? > > That depends on the printer, printer driver, and how you print. The > human eye can only see, at most, a few hundred graytones in any give > lighting. Some of the quadtone systems (like Piezography) smooth the > tonal transitions so though you can't distinguish the different tones, > the transition is smooth between them. This is a good thing. > > I am not familiar with the 2200. Does the 2200 use more than one ink > for printing B&W? If so, you are subject to a dither pattern using only > one ink, which is far inferior to using quadtone inks (four tones). If > you are dedicating this printer to B&W printing, you might want to > consider getting quad/hex tone inks for it and either using the > piezography driver (if it supports the 2200) or something like Paul > Roark's curves. If you want more info on any of this, please ask. > > Regards, > > Austin > > -- > To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html > > -- > To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html - -- __________________________________ Rob Heyman M.Photog 32 Binyara Street CHAPEL HILL Qld 4069 Ph 07 3878 3884 fax 07 3378 6639 __________________________________ - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html