# set terminal pngcairo  background "#ffffff" enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'image2.5.png'
unset key
set title "Close up of pixels having grid points (0,0), (0,2), (2,0) and (2,2)" 
set xrange [ -1.50000 : 3.50000 ] noreverse nowriteback
set yrange [ -1.50000 : 3.50000 ] noreverse nowriteback
set cbrange [ 0.00000 : 1.00000 ] noreverse nowriteback
plot '-' with rgbimage, '-' with points pt 7 ps 2 lt -1