[gdal-dev] add string field to img

[jdmorgan]

Hello,
I was hoping someone could help me out.  I have a raster .img file. with 
existing pixel values.  Those values are integer, but are classed to 
string values not currently in the same .img file.  For example pixel 
value 2 means ClassTwo. Is it possible to add the string values (a new 
field) onto the raster .img file?

Thanks,
Derek