Morten Sickel wrote: > 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.
If possible, avoid the use of r.composite and keep the data as separate bands. If you must use r.composite, higher values for levels= will result in slower rendering (hence the default value being 32 rather than 256). -- Glynn Clements <[EMAIL PROTECTED]> _______________________________________________ grassuser mailing list grassuser@grass.itc.it http://grass.itc.it/mailman/listinfo/grassuser