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
