[GRASS-user] i.rgb.his/i.his.rgb not working properly

[Georg Kaspar]

Hi,

I'm having some problems using i.rgb.his/i.his.rgb to convert quickbird 
data from RGB to IHS and vice versa (original purpose was pan 
sharpening). The results look totally weird and I don't know why.
Here is a protocol along with some screenshots:

[1] d.rgb r=szene1_mul.4 g=szene1_mul.3 b=szene1_mul.2
--> http://img96.imageshack.us/img96/9487/screen1i.png

[2] i.rgb.his r=szene1_mul.4 g=szene1_mul.3 b=szene1_mul.2 
h=szene1_234.h i=szene1_234.i s=szene1_234.s

[3] d.his h=szene1_234.h i=szene1_234.i s=szene1_234.s
--> http://img35.imageshack.us/img35/6746/screen2pm.png

[4] i.his.rgb h=szene1_234.h i=szene1_234.i s=szene1_234.s 
r=szene1_234.r g=szene1_234.g b=szene1_234.b

[5] d.rgb r=szene1_234.r g=szene1_234.g b=szene1_234.b
--> http://img246.imageshack.us/img246/1856/screen3pa.png

I also repeated the process using landsat data from the nc data set - 
same problem here.

g.version
GRASS 6.4.0RC5 (2009)

Did anybody experience similar problems?
bests,
Georg