binary operators
Done	+	-	*	/	<=	<	=	>=	>	!=	pow	min	max	& and	\| or	^ xor	% mod	<<	>>
Todo

unary operators
Done	abs	acos	asin	atan	ceil	cos	exp	floor	log	log10	round	sin	sqrt	tan	~ not
Todo

stack operators
Done	dup	drop	swap
Todo	if	pick	rot...

Special values
Done	X	Y	RADIUS	ANGLE	PI
Todo	R	G	B	A	H	S	V	PIX_DX PIX_DY ULX ULY LRX LRY Rmin Rmax ...

Image size in pixels
PIX_DX
PIX_DY

	ULX
ULY		LRY
	LRX

RGB

RGBA

HSV

HSVA

Color value boundaries		Formulas in rpn for (RGB / RGBA / HSV / HSVA) see help below
Rmin	Rmax	R
Gmin	Gmax	G
Bmin	Bmax	B
Hmin	Hmax	H
Smin	Smax	S
Vmin	Vmax	V
Amin	Amax	A

Help
Examples Special values in rpn formulas :
X Y coordinates of the pixel who's color is currently computed
PX PY pixel coordinates of the current pixel : upper left is 0,0 , upper right PIX_DX-1,0
RADIUS ANGLE : polar coordinates of the current pixel

PIX_DX PIX_DY ULX ULY LRX LRY Rmin Rmax ... : the values you specified previously
R G B A H S V : the value of the computed color attribute. No looping references autorized.