interface_build {
    {r.colors} 0
    {Assigns contrast stretch grey scale to raster}
    {entry map {Raster map:} 0 raster}
    {checkbox color {histogram-equalize} "" grey.eq}
    {checkbox color {histogram log transformed} "" grey.log}
    {separator grey 1}
    {checkbox -w {Don't overwrite existing color table.} "" -w}
    {checkbox -q {Run quietly.} "" -q}
}