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From: "Beppe Costagliola" <beppecosta@yahoo.it>
To: "TiffList" <tiff@remotesensing.org>
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Subject: Re: [Tiff] Tiff G4 
Date: Thu, 3 Mar 2005 18:09:04 +0100
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PDF's are created with tiff2pdf starting from a tiff G4 that is created with
an IBM proprietary software. That's why I'm interested to find a (free) way
to reduce the tiff size that can be applied to the original tiff before the
convresion to pdf that should then become smaller.


----- Original Message ----- 
From: "Bob Friesenhahn" <bfriesen@simple.dallas.tx.us>
To: "Beppe Costagliola" <beppecosta@yahoo.it>
Sent: Thursday, March 03, 2005 5:52 PM
Subject: Re: [Tiff] Tiff G4


> On Thu, 3 Mar 2005, Beppe Costagliola wrote:
>
> > Thanks Bob.
> > I will further investigate.
> >
> > (tiff I'm dealing with are graphyc reports that are converted to Pdf.
Some
> > of them must be retained at original fidelity but others can be archived
at
> > lower fidelity to save more space.)
>
> If you can depend on (and afford) Adobe or some other commercial PDF
> creation software, then JBIG may be the best solution.  Of course,
> then the PDF viewer needs to include support for JBIG.  This may
> require a recent Adobe Acrobat viewer and may rule out some other
> viewers.
>
> JBIG is an amazingly effective compression algorithm for black/white
> images.  Except for the patent issues, it would be heavily used now.
>
> Bob
>
> >
> > Beppe.
> >
> > ----- Original Message -----
> > From: "Bob Friesenhahn" <bfriesen@simple.dallas.tx.us>
> > To: "Beppe Costagliola" <beppecosta@yahoo.it>
> > Cc: "TiffList" <tiff@remotesensing.org>
> > Sent: Thursday, March 03, 2005 5:30 PM
> > Subject: Re: [Tiff] Tiff G4
> >
> >
> >> On Thu, 3 Mar 2005, Beppe Costagliola wrote:
> >>
> >>> I though that I could use "tiffcp -c none" and then "tiffcp -c jpeg"
but
> >>> unfortunately I don't have a tiffcp working and I could not see if it
is
> >>> possible.
> >>
> >> JPEG is designed to compress "natural scene" images.  Typically these
> >> are 8-bit gray or RGB images.  It is *terrible* at compressing one bit
> >> images and does very poorly with line drawings.
> >>
> >>> About "re-sampling/filtering" do you know any open source (in C) that
> > does
> >>> the job ?
> >>
> >> Any image processing package which supports filtering algorithms and
> >> thresholding will do.  One such package is GraphicsMagick
> >> (http://www.GraphicsMagick.org/).  I hear good things about a package
> >> called VIPS (http://www.vips.ecs.soton.ac.uk/).  You can use a filter
> >> to "blur" the image or remove "speckles" and then apply thresholding
> >> in order to obtain a smoothed monochrome image with less detail, but
> >> which compresses better.
> >>
> >> If your image is based on some sort of a drawing, you may find a tool
> >> like autotrace (http://sourceforge.net/projects/autotrace/) to be
> >> valuable.  It will take lots of trial and error and lots of CPU time
> >> to use autotrace.  Autotrace would convert your image to a high level
> >> vector format which can be re-rendered in a "smoother" fashion so that
> >> it compresses better.
> >>
> >> The SWF file displayed via
> >> http://www.springcreekcommunity.org/map/body.html was accomplished
> >> using autotrace.
> >>
> >> Bob
> >> ======================================
> >> Bob Friesenhahn
> >> bfriesen@simple.dallas.tx.us,
http://www.simplesystems.org/users/bfriesen/
> >> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
> >
> > _______________________________________________
> > Tiff mailing list
> > Tiff@remotesensing.org
> > http://xserve.flids.com/mailman/listinfo/tiff
> >
>
> ======================================
> Bob Friesenhahn
> bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/

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