[scribus] 600 dpi

[John Culleton]

On Tuesday, June 07, 2011 04:45:39 pm Jan Schrewe wrote:
> On 7 June 2011 22:40, John Culleton <john at wexfordpress.com> wrote:
> > On Tuesday, June 07, 2011 04:25:50 pm Ted Powell wrote:
> > > On Tue, Jun 07, 2011 at 04:11:05PM -0400, John Culleton wrote:
> > > > On Tuesday, June 07, 2011 09:24:58 am Gregory Pittman wrote:
> > > > [...]
> > > > My favorite printer wants 300 dpi for photos and 600 dpi for line
> > > > art.
> > > 
> > > FWIW, my HP CLJ 2605dn does up to 1200x1200 black and 600x600 colour,
> > > and it's a quite modestly priced machine.
> > 
> > Printed text is in some form of vector format. To reproduce it crisply
> > requires much higher dpi when it is rasterized late in the prepress
> > processing. For commercial printers 2500+ is common. The reason your
> > desktop
> > printer has the ability to print 1200 x 1200 is for text, not illos.
> 
> The printer has a max resolution of 600x600 dpi [1]. The rest is fancy
> positioning of the dots. Though I wonder why a RIP should care wether ir
> places dots for an photo or for a letter shaped image :-)


Text is far less tolerant of jaggies. That is why it is rasterized late in the 
process and at a very high resolution.

When we are preparing input for print the pdf file may contain both text and 
illos. To keep file size within reason the bitmap parts, illos etc. should be 
kept at a smaller dpi. The vector part (print) has no inherent dpi. RIP will 
convert both types to a very high DPI for final printing. 
-- 
John Culleton
Wexford Press
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