[GRASS-user] can the grass calculate the area of different color for a image(tiff or other?)

[maven apache]

>
> Also I found that I can see only five color from the tiff swi.tiff, and
>> yesterday I get five category with the same steps(import and composite then
>> calculate ), they are
>> "0
>> 9321 26425 31744 32736   ";, but today it change to six!!
>
> Maybe I  remembered it wrongly. (*^__^*)

>
>  And acturlly I want to extract each color and export them to a vector map,
>> I am looking the proper commond.
>>
> It seems that there is no corresponding command to  achieve this goal£¿
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