lues.
</DD>
</DL>
<BR>
<BR>

<A NAME="39771"></A>
<B>:monochromize</B> <EM>&amp;optional (NTSC nil) </EM>[method]

<DL COMPACT>
<DT> 
<DD> 
computes brightness from RGB components and returns a new <TT>pixel-image</TT>.
If <EM>NTSC</EM> is nil, <SPAN CLASS="MATH"><IMG
 WIDTH="109" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
 SRC="manual-img118.png"
 ALT="$ (R+G+B)/3$"></SPAN> is computed.
If T, <!-- MATH
 $0.299*R+0.587*G+0.114*B$
 -->
<SPAN CLASS="MATH"><IMG
 WIDTH="235" HEIGHT="30" ALIGN="MIDDLE" BORDER="0"
 SR