Date:         Mon, 22 Jul 2002 08:26:35 -0500
Reply-To:     Kevin Myers <KevinMyers@AUSTIN.RR.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Kevin Myers <KevinMyers@AUSTIN.RR.COM>
Subject:      Re: tiny dots in hi res JPEG graphic
Content-Type: text/plain; charset="iso-8859-1"

A bit more explanation:  JPEG uses lossy image compression technology that
is designed for "natural" images where minor defects in the image won't be
noticed.  It really isn't very appropriate for images such as technical
graphics that are made up of shapes with lots of solid colors and high
contrast boundaries.  If you really *MUST* use JPEG, then some programs will
let you adjust the compression algorithm to minimize or eliminate the kinds
of artifacts that you have noticed.  Otherwise, you need to use a lossless
format such as GIF, PNG, BMP, TIFF, etc.  Several of these formats also
support image compression, but they don't use lossy compression algorithms,
so the original image quality is maintained.  Hope this helps.

Kevin M.


----- Original Message -----
From: "Paige Miller" <paige.miller@KODAK.COM>
Newsgroups: bit.listserv.sas-l
To: <SAS-L@LISTSERV.UGA.EDU>
Sent: Monday, July 22, 2002 7:19 AM
Subject: Re: tiny dots in hi res JPEG graphic


> Annette wrote:
>
> > I wrote a program that produces a fine GPLOT graphic in JPEG format.
> > However, if I look closely there are some tiny "dots" in selected
places,
> > especially around the texts (e.g. title, legend, footnote), the border,
and
> > the grid. Especially in print this looks quite irksome. Any idea how
could I
> > get rid of these "dots"?
>
>
> Sure, its easy. Don't use JPEG as your output method. Use GIF or PNG.
>
>
> --
> Paige Miller
> paige.miller@kodak.com
> http://www.kodak.com
>
> "It's nothing until I call it!" -- Bill Klem, NL Umpire
> "When you get the choice to sit it out or dance, I hope you dance" --
> Lee Ann Womack