This command properly draws a 1 pixel x 100 pixel green to transparent gradient which is the echo'd to the screen.
exec ("convert -size 1x100 gradient:green-none ".$_SERVER['DOCUMENT_ROOT']."/temp/FAFAFA_trans2.png");
echo "<img src='/temp/FAFAFA_trans2.png' width='100' height='500'>";
However, it's a 50/50 bleed of green turning into transparent at the end.
I'm looking to have that transparency fade out much sooner. more like a 20/80 gradient. How can I create such an 'on the fly' gradient image weighting the strength of one color vs another.