Digital BW, The Print

Thanks Doug.

I guess then converting the images in PS& from 8 bits to 16 bits should do the trick.  I 
am saving the images in PS7 also @ 400ppi.

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Doug Nielsen" 
<douglasnielsen@e...> wrote:
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "luisvcool" <lvictoria@t...> 
> wrote:
> > Ok.  If i scan an image at 8 bits and before I print in on OPM I convert it to 16 
> > bits in PS7 and save the file,  will the resulting 16 bit image look better than if I 
had 
> > saved it at 8 bits and then printed it?
> > 
> > I'm confused.
> > 
> 
> 
> A couple of months ago I discovered that OPM prints from 8-Bit files at resolutions 
> under about 450 dpi displayed stair stepped diagonals - at least when examined 
with 
> a loupe. So, I did a series of prints to examine the 8-Bit vs 16-Bit treatment with 
> OPM. There was no question that feeding OPM with a 16-Bit file was better than 
with 
> an 8-Bit file. The effect was about the same as resampling an 8-Bit file up by a 
factor 
> of two. An 8-Bit file at 720 dpi produced about the same results as a 16-Bit file at 
> 360 dpi.
> 
> I don't know why this occurs, but I satisfied myself with the rationale that OPM 
> requires a 16-Bit file, and does an internal conversion to 16-Bit when fed files that 
> are at 8-Bit. Apparently the OPM conversion routine has a problem. So that 
problem 
> can be avoided by always feeding OPM with 16-Bit files. Within PS7 there is no 
> apparent effect of a simple 8- to 16-Bit conversion so it is much better approach 
> than resampling to solve the problem.
> 
> Doug Nielsen