On Fri, Aug 01, 2003 at 09:59:52PM +0200, Henk Abma wrote:
>
>
> > Well, obviously it does support jpegs out of the box, it just isn't
> > doing quite what you were expecting it to do.
> >
>
> Clear. Converting the image to a size of 72*8.5 results in an image that
> prints correctly. pnmtops does the scaling automatically as someone else
> pointed out. However I assume this down-scaling destroys a lot of detail
> from the original. So, I'd still like to know how I can reproduce a 300-dpi
> color scan on a 300- or 600 dpi printer. For if I understand you both
> correctly, with cups' lp or pnmtops I'm only printing 72dpi images
Not quite true. pnmtops _assumes_ that any image it gets is 72dpi,
because PNM files have no resolution information embedded in them like
TIFF or JPEG files do. However, the entire image at its full resolution
is written out to the Postscript file, and the scaling is done in the
Postscript interpreter. Which may, of course, be inside the printer;
I don't know the details of the printer you have.
On the other hand, as I mentioned before, you _are_ losing information
simply because a 300 dpi printer doesn't have the level of colour resolution
within each pixel as a 300 dpi scanner does. There's no way around that
with software, either, though a proper postscript interpreter should give
you as good a result as possible.
---------------------------+---------------------------------------------------
Bryan Feir VA3GBF|"A half-truth, like a half-brick, is more forcible
Home:[EMAIL PROTECTED] | in an argument than a whole one...
| it carries further." -- Stephen Leacock
---------------------------+---------------------------------------------------
--
[EMAIL PROTECTED] mailing list
