Xref: utzoo sci.electronics:3893 rec.audio:8441 Path: utzoo!attcan!uunet!ncrlnk!ncr-sd!hp-sdd!ucsdhub!ucsd!rutgers!mailrus!cornell!uw-beaver!apollo!ulowell!cg-atla!hjortsho From: hjortsho@cg-atla.UUCP (Erik Hjortshoj) Newsgroups: sci.electronics,rec.audio Subject: Re: Looking for Blue LEDs Keywords: blue blue blue, not yellow or red or green Message-ID: <5872@cg-atla.UUCP> Date: 23 Sep 88 13:20:00 GMT References: <1138@nmtsun.nmt.edu> <862@ritcv.UUCP> <255@rna.UUCP> <4422@lynx.UUCP> <871@ritcv.UUCP> Reply-To: hjortsho@cg-atla.UUCP (Erik Hjortshoj) Organization: Compugraphic Corp. Wilmington, MA Lines: 24 In article <871@ritcv.UUCP> cep4478@ritcv.UUCP (Christopher E. Piggott) writes: > > >Question: why are R.G.B. monitors Red, GREEN, blue, when GREEN is not one of >the primary colors (being a combination of blue and yellow)? Why shouldn't >it be red, YELLOW, blue? You are confusing the primary PIGMENT colors with primary LIGHT colors. Pigment's primaries are, indeed, red, blue and yeller. If you mix them all together you get black. Light's primaries are red(it's not actualy red but I forget what), green and blue. If you mix them all together you get white. >Projection televisions work the same way ... is it possible to emit green, >and blue 180 degrees out of phase with the blue component of the green, to >cancel out the blue and the green and make yellow? If not, how do you make >yellow? I don't remember, but it IS a mix of the primaries. (red-green maybe) A lot of intro physiscs books have diagrams of the mixes of both pigments and light. An encyclopedia would have it as well. Erik H.