[xep-support] JPG compression?

Peter Drivas peter.drivas at gexinc.com
Mon Feb 24 14:16:10 PST 2003


Thanks. We definitely are using 300 dpi images. I'm going to try rendering
with versions 2.7 and 3.2.1 for comparison. I'm also going to try PNG
images.

Peter

> -----Original Message-----
> From: owner-xep-support at www.renderx.com
> [mailto:owner-xep-support at www.renderx.com]On Behalf Of Clay Leeds
> Sent: Monday, February 24, 2003 4:26 PM
> To: xep-support at renderx.com
> Subject: Re: [xep-support] JPG compression?
>
>
> Clay Leeds wrote:
> > Nikolai Grigoriev wrote:
> >
> >> JPEG is generally not the best format for line art containing
> >> sharp edges - it tends to create transition effects ("JPEG artifacts").
> >> Edge fuzziness is inherent for the type of compression used in JPEG;
> >> there's nothing to do. You may consider other, non-lossy formats
> >> instead. For example, PNG is equally efficient with XEP: unless
> >> there are some special features like gamma, interlacing, or alpha
> >> channel,
> >> the data are copied transparently from the input file to the resulting
> >> PDF, generating no overhead even for big images.
> >>
> >> Best regards,
> >> Nikolai Grigoriev
> >> RenderX
> >
> > I had some problems with "fuzziness" with my JPG images. Then I
> realized
> > that I was printing at +300dpi, and the JPG had a 72dpi resolution. I
> > changed my JPG to 300dpi, and much of the fuzziness went away. That
> > said, TIFF or PNG might improve the clarity, although SVG might be even
> > better (I think SVG is supported by XEP?).
>
> I should add, that I had to convert my original vector/EPS drawing to
> 300dpi. Starting from a 72dpi and moving to 300dpi shrinks the size of
> your image by 50% or more (garbage in, garbage out ;-). I had to start
> with a larger version of my logo, then convert to 300dpi. I hope this is
> relevant to the discussion and helps!
>
> Web Maestro Clay
> --
> Clay Leeds - cleeds at medata.com
> Web Developer - Medata, Inc. - http://www.medata.com
> PGP Public Key: https://mail.medata.com/pgp/cleeds.asc
>
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