Thank you Ed and Armin for your suggestions.
I will give a try and report how it works.
Sounds reasonable to compress a number of lines or tiles rather than the
whole image at once.
Thanks,
Andreas
Armin Burger wrote:
Andreas,
I made once quite good experiences with scanned b&w images using the
Fax Encoding (CCITT) Group 4 TIFF compression. The images had no
overviews, but were also just shown at a scale that was reasonable for
the details on them. The compression was typically good, something
like 3 to 5 times.
Armin
Andreas Neumann wrote:
Hello list,
I have a question on compression in tiff files.
I read that for best mapserver performance it is recommended to store
tiff files on the server in uncompressed format. We currently have a
disk space problem and need to serve a large number of raster images.
Is there any compression technique that allows to save diskspace
while maintaining a reasonable or good performance? Or is compression
not recommended at all?
Another question: we need to serve 1bit (b+w) rasterimages that are
delivered as gray/rgb jpegs later because we want to use resampling.
What is the best color depth to store the original images. I noticed
that when keeping them in 1bit color depth one cannot create pyramids
using gdaladdo. Is it better to store them in 1 bit with no pyramids
or in 8bit gray value with pyramids?
Thank you for any help on my questions,
All the best,
Andreas
--
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Andreas Neumann
Institute of Cartography
ETH Zurich
Wolfgang-Paulistrasse 15
CH-8093 Zurich, Switzerland
Phone: ++41-44-633 3031, Fax: ++41-44-633 1153
e-mail: [EMAIL PROTECTED]
www: http://www.carto.net/neumann/
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