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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 17:35:47 +0100
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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.)

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/

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