cmy in moving lights

[Tigglet]

I am trying to write a primer on types of colour mixing I know that led fixtures use rgb as to monitor screens etc and that when printing you use cmyk mixing. however I also know that the three colour filters in intelligent fixtures where colour blending is possible is cmy (as well as fixed dichoic filters for specific saturated colours.)

 

I am looking for a website that can explain why cmy is used in moving lights. I have looked at the wiki of BR as well as surfed the web but so far I have not had any satisfactory results.

Any advice is gratefully recieved

[henny]

when using CYM you just take away what you don't want from white rather than trying to add together R,G,B light .

 

CMY mixing normally uses 3 graduated disks that start at clear and end up as full C,Y or M, by varying the rotation of each disk you get your mixing

 

To do RGB in a single light source head you would have to split the white light in to RGB using a prism then dim each separately then recombine.

[niclights]

Google 'subtractive colour mixing'.

[mac.calder]

I am trying to write a primer on types of colour mixing

 

Hate to sound really negative, but I assume then that you are writing a school paper... If that is the case, you really need to do a lot of reading on the properties of colour ("What is colour?") and and also "What is white light", because it is fairly clear you do not have an understanding of the base material you are trying to cover - CMY mixing is one of the very base fundamentals of your topic. If you are not writing a school paper, then maybe you are not the person to be writing this primer...

[Tigglet]

when using CYM you just take away what you don't want from white rather than trying to add together R,G,B light .

 

CMY mixing normally uses 3 graduated disks that start at clear and end up as full C,Y or M, by varying the rotation of each disk you get your mixing

 

To do RGB in a single light source head you would have to split the white light in to RGB using a prism then dim each separately then recombine.

 

Thanks this is is just what I was looking for.

[Richard CSL]

I would suggest the reason CMY is used in moving heads is that it produces a smooth transition from one colour to another,

 

whereas using a dichroic colour wheel the colours can only be blacked out then changed then faded up in order to produce a non "snapping" of colour to colour. this may include going half way round the colour wheel too.

 

It depends on the effect you are after. a good example of CMY blending of colours can be found on the Pink Floyd Pulse concert video.

[jonathanhill]

I would suggest the reason CMY is used in moving heads is that it produces a smooth transition from one colour to another,

See post #2.

[Smiffy]

Also Google Lighting Design Colour Theory, as well as Lighting Design Color Theory. Should get you plenty of reading material.

 

Cheers

 

Smiffy

[musht]

Google additive and subtractive colour mixing.

 

Various ways of looking at it here:

 

http://www.colorcube.com/articles/articles.htm

 

the puzzle itself is a thing of beauty and a joy forever, recommended.