# set terminal pngcairo  background "#ffffff" enhanced font "arial,8" fontscale 1.0 size 540, 360 
# set output 'argb_hexdata.2.png'
set grid nopolar
set grid xtics nomxtics ytics nomytics ztics nomztics nortics nomrtics \
 nox2tics nomx2tics noy2tics nomy2tics nocbtics nomcbtics
set grid vertical layerdefault   lt 0 linecolor 0 linewidth 0.500,  lt 0 linecolor 0 linewidth 0.500
unset key
set view 33, 46, 1, 1
set style data lines
set xtics  norangelimit 1 
set ytics  norangelimit 1 
set ztics  norangelimit 1 
set cbtics  norangelimit 1 
set rtics  norangelimit 1 
set title "Alpha+RGB image data loaded from a hexadecimal matrix" 
set xrange [ -0.500000 : 3.50000 ] noreverse
set yrange [ -1.00000 : 3.50000 ] noreverse
NO_ANIMATION = 1
set pixmap 123 'gradient.png' # (256 x 256 pixmap)
set pixmap 123 at screen 0, 0, 0  size screen 1, 1 behind 
## Last datafile plotted: "$BITS"
splot $BITS matrix using 1:2:(1.0):3 with rgbalpha pixels