[GRASSLIST:4004] Landsat image mosaicing

Dear all, 
I've been trying to mosaic two scenes of Landsat images (2 rows) by
using i.image.mosaic.tcl in GRASS 5.3.0 and r.pacth. I want the mosaic
image will be smooth, but the result is far from good. 
I hope any of you could help me to solve this problem.
Thanks for your help.

Regards,

Firman Hadi,
Research Group on 
Monitoring Environmental Dynamics (ReGMED),
Department of Geodetic Engineering and Geomatics,
Institute Technology of Bandung,
Jl. Ganesha 10, Bandung 
INDONESIA

mosaic.png
Description: PNG image