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copied!<p>EDIT: responding to the OP's edit up top to make it easier to find:</p> <p>There are a <a href="http://www.gnuplot.info/docs/gnuplot.html" rel="nofollow noreferrer">variety of ways to make gnuplot render directly to a file</a> (scroll down to "Terminal") which you can then read in for analysis. For example, you can <a href="http://en.wikipedia.org/wiki/Netpbm_format#PBM_example" rel="nofollow noreferrer">output to portable bitmap format</a> which is strikingly easy to read and write (if not small and elegant). Note that, by definition, PBM will give you an array of blacks and whites. </p> <p>For example, check out this use of the <a href="http://www.gnuplot.info/docs/node406.html" rel="nofollow noreferrer">"set terminal" and "set output" commands</a> to render to a series of Unix pipes that produce a pbm and then a png file.</p> <p>End EDIT:</p> <p>Gnu Octave defaults to using gnuplot for plotting and it happens that gnuplot is quite good at producing filled polygons. Here are some <a href="http://gnuplot.sourceforge.net/demo/fillcrvs.html" rel="nofollow noreferrer">helpful demonstrations</a> of exactly that sort of thing. For example, <a href="http://gnuplot.sourceforge.net/demo/fillcrvs.4.gnu" rel="nofollow noreferrer">here are some filled polygons</a>:</p> <pre><code># set terminal png transparent nocrop enhanced font arial 8 size 420,320 # set output 'fillcrvs.4.png' set grid nopolar set grid xtics nomxtics ytics nomytics noztics nomztics \ nox2tics nomx2tics noy2tics nomy2tics nocbtics nomcbtics set grid front linetype 0 linewidth 1.000, linetype 0 linewidth 1.000 set key outside right top vertical Right noreverse enhanced autotitles nobox set title "The red bat: abs(x) with filledcurve xy=2,5" plot abs(x) with filledcurve xy=2,5 </code></pre> <p><a href="http://gnuplot.sourceforge.net/demo/fillcrvs.4.gnu" rel="nofollow noreferrer">Here's another demonstration script</a> that draws the crazy face at the bottom of the filled curves page:</p> <pre><code># set terminal png transparent nocrop enhanced font arial 8 size 420,320 # set output 'fillcrvs.6.png' unset border set dummy t,y set grid nopolar set grid xtics nomxtics ytics nomytics noztics nomztics \ nox2tics nomx2tics noy2tics nomy2tics nocbtics nomcbtics set grid layerdefault linetype 0 linewidth 1.000, linetype 0 linewidth 1.000 unset key set label 1 "gnuplot" at 0, 1.2, 0 centre norotate front nopoint offset character 0, 0, 0 set label 2 "gnuplot" at 0.02, -0.6, 0 centre norotate front nopoint offset character 0, 0, 0 set arrow 1 from -0.1, 0.26, 0 to 0.18, -0.17, 0 head front nofilled linetype 5 linewidth 4.000 size first 0.100,40.000,90.000 set parametric set size ratio 1 1,1 set noxtics set noytics set title "Let's smile with parametric filled curves" set xrange [ -1.00000 : 1.00000 ] noreverse nowriteback set yrange [ -1.00000 : 1.60000 ] noreverse nowriteback plot [t=-pi:pi] sin(t),cos(t) with filledcurve xy=0,0 lt 15, sin(t)/8-0.5,cos(t)/8+0.4 with filledcurve lt 3, sin(t)/8+0.5,cos(t)/8+0.4 with filledcurve lt 3, t/5,abs(t/5)-0.8 with filledcurve xy=0.1,-0.5 lt 1, t/3,1.52-abs(t/pi) with filledcurve xy=0,1.8 lt -1 </code></pre>

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