# set terminal pngcairo  background "#ffffff" enhanced font "arial,8" fontscale 1.0 size 540, 360 
# set output 'argb_hexdata.1.png'
unset key
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"
plot 1+2*sin(x*x) lw 4 lc "black", $BITS matrix using 1:2:3 with rgbalpha pixels,      $BITS matrix using 1:2:(sprintf("0x%08X",$3)) with labels center font ",12"