grdhisteq - Histogram equalization for grd files grdhisteq in _ grdfile [ -G out _ grdfile ] [ -C n _ cells ] [ -D ] [ -N [ norm ] ] [ -Q ] [ -V ] grdhisteq allows the user to find the data values which divide a given grdfile into patches of equal area. ... One could use grdhisteq to write to stdout an ASCII list of those data values which divide the range of the data into n _ cells segments, each of which has an equal area in the image. ... C Sets how many cells (or divisions) of data range to make. ...