[GRASS-user] Error i.pansharpen landsat8 image !

[Mounirsky]

Dear users,I'm using grass.script.core to run the "i.pansharpen" command as
fallow :['i.pansharpen', '--o', 'blue=LC8_image_B2', 'green=LC8_image_B3',
'red=LC8_image_B4', 'output=pan_brovey', 'method=brovey',
'pan=LC8_image_B8']and I get this error :/Calculating Brovey
transformation...Assigning grey equalized color tables to output
images...Traceback (most recent call last):  File
"/usr/lib/grass72/scripts/i.pansharpen", line 452, in     main()  File
"/usr/lib/grass72/scripts/i.pansharpen", line 319, in main    flags="e",
color='grey')  File "/usr/lib/grass72/etc/python/grass/script/core.py", line
410, in run_command    return handle_errors(returncode, returncode, args,
kwargs)  File "/usr/lib/grass72/etc/python/grass/script/core.py", line 329,
in handle_errors   
returncode=returncode)grass.exceptions.CalledModuleError: Module None :
['r.colors', '--q', '-e', 'color=grey', 'map=pan_brovey_red'] ended with an
error/Can you please help me to get it work ?Regards,



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