|Looking for (approx) RGB equivalents for Gel colors is being discussed in the ControlBooth Lighting and Electrics forum; Anyone know where there are charts that define the Rosco , GAM , Apollo , and Lee colors into RGB ...|
Co-Creator of Plexus - a software only solution for controlling Conventional and Moving Lights
Rosco R27 = Primary Red, R91 = Primary Green, R80 = Primary Blue
I don' know the other equivalents.
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A long time ago, maybe 1992/93, I attempted to write a computer program to display gel colors to aid in selecting colors when designing shows. At the time, I called a few gel manufacturers and even talked to an engineer who explained Chromaticity to me. It ended up resulting in a fairly straight-forward math equation in my BASIC program and it had to do with colors changing based on intensity (and this being a way to overcome that factor). I wish I could remember it all, sadly I got side-tracked and never completed the program but I did have it working. I'm not sure if anyone has broken all the various gel colors down to RGB but at the time I was told that wasn't the way to go based on the fact intensity (and other factors) affected the final color. Understand Chromaticity and you'll be able to calculate colors at any intensity, or at least that's the conclusion I came to...
Why Hello Mike. Welcome to the Booth. Are you the Mike Wood from Mike Wood Consulting, or are there two sources of information in the Austin area going by that name these days?
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Here's what I've commonly found, because all the fixtures that use RGB values come from so many different manufacturers, your values differ from fixture to fixture from manufacturer to manufacturer. Lets use an LED PAR for example. One manufacturer will produce a LED PAR that has a certain look for R @ 50 , G @ 36 , & B @ 72 (kind of a lavender, very pretty!) while another LED PAR that comes from another manufacturer has a slightly different look for those same values. Basically what that says is that the manufacturers who make your gels (rosco, lee, etc.), can give you the closest RGB values that will create that gel color, but it's simply impossible for them to compensate for the difference from fixture to fixture. My recommendation, use the values that they give you, but don't stop there. Manipulate them a little more to get the colors as close as possible. The iSwatch app is very good though.
Last edited by jlouisstahl; November 4th, 2012 at 08:50 PM.