# set terminal pngcairo  background "#ffffff" enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'image.5.png'
unset key
set view map
set style data pm3d
set style function pm3d
set xtics border out scale 1,0.5 mirror norotate  offset character 0, 0, 0 autojustify
set ytics border out scale 1,0.5 mirror norotate  offset character 0, 0, 0 autojustify
set ztics border out scale 1,0.5 nomirror norotate  offset character 0, 0, 0 autojustify
set cbtics border out scale 1,0.5 mirror norotate  offset character 0, 0, 0 autojustify
set rtics axis out scale 1,0.5 nomirror norotate  offset character 0, 0, 0 autojustify
set title "As with 3d color surfaces, a color box may be added to the plot" 
set xrange [ 10.0000 : 117.000 ] noreverse nowriteback
set yrange [ 10.0000 : 117.000 ] noreverse nowriteback
set cbrange [ 0.00000 : 255.000 ] noreverse nowriteback
set pm3d explicit at b
set palette positive nops_allcF maxcolors 0 gamma 1.5 gray
splot 'blutux.rgb' binary array=(128,128) flipy format='%uchar%uchar%uchar' using ($1+$2+$3)/3 with image