problems w. i.composite

[Michael Shapiro]

The algorith in i.composite simplistic. Try i.median and see if you
get better results.

|I have been having problems making composite color images from 
|three Landsat MSS bands. I have run i.composite, and specified the three 
|data bands. The program seems to run normally and produces a new raster
|file which looks relatively normal, but it has too few colors or data values: 
|it seems that similar values are being clumped together so that the
|resulting image has only a dozen or so different values/colors. The
|problem isn't with the monitor -- a histogram and stats of the compostite
|map shows just a series of spikes, not a smooth curve.  I tried
|rescaling the different bands of data, to make sure that they're all
|at the same scale, but the results were about the same (is this necessary
|in i.composite, or does it account for differences in scale?) Are there any 
|secrets to getting i.composite to produce the clean smooth images I'm 
|looking for?



Michael