I am working with some aerial photograps, I have sets of pancromatic black and white pictures and colored infrared pictures. the pan-images were imported directly and displays quite qickly, each image being about 150M. When I imported the colored IR pictures, they came in as three bands, each about the same size as the pancromatic picture. Then I used r.composite to recreate the colored picture, and got a file on about 500M. When I use d.rast to display the composite file, things takes ages, nothing seems to happen for a long while. d.rast uses more or less 100% of the CPU but not much memory. I recall the xdriver being slow when displaying rasters with a large color space as an issue some years ago, but I thought that worked better now… Are there anything I can do to make it work better? I have presently 24 bits color depth, but that is going to increase to 36 bits (3x12bits) later on, if that goes even slower, I will have a problem…
My machine is a 1,5 GHz with 1 GB of RAM running linux, no speedmonster, when displaying the same maps in qgis, it goes quite a bit faster.
I am working with some aerial photograps, I have sets of pancromatic black
and white pictures and colored infrared pictures. the pan-images were
imported directly and displays quite qickly, each image being about 150M.
When I imported the colored IR pictures, they came in as three bands, each
about the same size as the pancromatic picture. Then I used r.composite to
recreate the colored picture, and got a file on about 500M. When I use d.rast
to display the composite file, things takes ages, nothing seems to happen for
a long while. d.rast uses more or less 100% of the CPU but not much memory. I
recall the xdriver being slow when displaying rasters with a large color
space as an issue some years ago, but I thought that worked better now.. Are
there anything I can do to make it work better? I have presently 24 bits
color depth, but that is going to increase to 36 bits (3x12bits) later on, if
that goes even slower, I will have a problem...
1) check "g.region -p" If rows & columns is much greater than 10000x10000 you
might want to consider using a more coarse resolution. Check r.info for the
images too.
2) Try d.rgb instead of r.composite.
Hamish
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