[GRASSLIST:1960] Color composition of Landsat image using GRASS

[Wisa Wisesjindawat]

> > Hi all,
> >
> > We have some questions to ask all of you:
> >
> > 1. My friend did color composition of Landsat TM-5 image using GRASS.
She
> > used the bands 4,3 and 2 (red,green,blue) as input bands. At the result,
> > she has found that the pixels value in the output image is more than
> > 255, i.e in the range of 1 to 512. It seems strange, because the pixels
> > value should not more than 255. Do you know why?
> >
> > 2. She has find out also that in band 5,6 and 7 of Landsat TM, the
> > pixels value are more than 255? Could you explain us?
> >
> > Best regards
> >
> > Wisa> >