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You can set most consoles to treat CMY as RGB just to twist your brain around. </div>
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<div id="editor-signature">Herrick Goldman<br>
917.797.3624<br>
www.EvokeCollaborative.com<br>
www.HGLightingDesign.com<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Stagecraft <stagecraft-bounces@theatrical.net> on behalf of Riter, Andrew via Stagecraft <stagecraft@theatrical.net><br>
<b>Sent:</b> Tuesday, January 13, 2026 5:39 PM<br>
<b>To:</b> Stagecraft Mailing List <stagecraft@theatrical.net><br>
<b>Cc:</b> Riter, Andrew <andrew.riter@ubc.ca><br>
<b>Subject:</b> Re: [SML] Moving Light Colour Mixing philosophy question</font>
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<div class="PlainText">Thank you all. Interesting. This could be a good discussion.<br>
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I like Jerry's point of white source = all colours / RGB = spiky RBG versions of a colour, so subtractive is better colour. But subtractive is also less intensity in the saturated colours.<br>
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The question is more: why are subtractive systems CYM and not RGB?<br>
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Andrew M. Riter <br>
Assistant Technical Director, Head Lighting Technician<br>
Chan Centre <br>
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Phone 604 822 2372<br>
andrew.riter@ubc.ca<br>
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-----Original Message-----<br>
From: Stagecraft <stagecraft-bounces@theatrical.net> On Behalf Of *Hobbit* via Stagecraft<br>
Sent: Tuesday, January 13, 2026 12:48 PM<br>
To: stagecraft@theatrical.net<br>
Cc: *Hobbit* <hobbit@avian.org><br>
Subject: Re: [SML] Moving Light Colour Mixing philosophy question<br>
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[CAUTION: Non-UBC Email]<br>
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I found that it helped to think of CMY as RGB turned upside-down, in terms of what sliders do.<br>
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For why CMY is still there, if it's a profile unit that needs beam consistency all the way through complex optics, RGB(AW) chips would probably get weirdly patchy by the time the light hit a target. Some "par" units do that too, and need some strategically-placed
frost to even out the wash a bit more. I guess nobody's yet making a multi-color COB emitter? Possibly more efficient too, but I haven't researched the LPW of those vs. typical multi-chip emitters.<br>
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_H*<br>
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