Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Ernst Dinkla <E.Dinkla@c...> 
wrote:
> Roy Harrington wrote:
> 
> > 
> > 
> > What I usually do is simply send my files to QTR at whatever PPI they
> > already are rather than re-sampling.   In general I have files that are
> > between 360 and 720.  In the PC version what happens is the PPI of
> > the input is upsampled to 1440x720ppi using a bi-linear algorithm.  For
> > inputs of at least 360ppi I expect this upsampling is good enough.
> > Anything less should be upsampled using a better algorithm like
> > bi-cubic or what Qimage does.
> > 
> > Given all that if you are using Qimage probably the best would be to
> > feed QTR a file of 720ppi rather than 360 but whether you'll see the
> > difference is probably image dependent and how close you look at it.
> > 
> > Roy
> 
> Roy,
> 
> Is that 1440 x 720 PPI used for all Epsons, even the 9000 ?
> 
> Ernst

Hi Ernst,

Yes,  the basic idea is that you want to know the gray value for each
dot location on the print.   So whatever DPI you print at becomes the
PPI that you upsample to.

Roy