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>  The standard conversion from RGB to gray, documented in the  
> textbooks, is grey level =  .33R+.5G+.17B.  So a unitary conversion  
> back to RGB is fine.

Many systems - such as PostScript - use the NTSC coefficients, see  
http://poynton.com/notes/colour_and_gamma/GammaFAQ.html#luminance ,  
http://en.wikipedia.org/wiki/Luminance_(video)

--Toby
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<HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; =
-khtml-line-break: after-white-space; "><DIV><BLOCKQUOTE =
type=3D"cite">=A0The standard conversion from RGB to gray, documented in =
the textbooks, is grey level =3D=A0 .33R+.5G+.17B.=A0 So a unitary =
conversion back to RGB is fine.=A0</BLOCKQUOTE><BR></DIV><DIV>Many =
systems - such as PostScript - use the NTSC coefficients, see=A0<FONT =
class=3D"Apple-style-span" size=3D"3"><SPAN class=3D"Apple-style-span" =
style=3D"font-size: 12px;"><A =
href=3D"http://poynton.com/notes/colour_and_gamma/GammaFAQ.html#luminance"=
>http://poynton.com/notes/colour_and_gamma/GammaFAQ.html#luminance</A> =
,=A0<A =
href=3D"http://en.wikipedia.org/wiki/Luminance_(video">http://en.wikipedia=
.org/wiki/Luminance_(video</A>)</SPAN></FONT></DIV><BR><DIV>--Toby</DIV></=
BODY></HTML>=

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