Electronic Theatre Controls
Welcome to ETC's Online Community

Color control on Selador Lustr

rated by 0 users
Not Answered This post has 0 verified answers | 7 Replies | 3 Followers

Not Ranked
4 Posts
bltzr posted on 04-22-2011 9:48 AM

Hi there !

I'm currently working on the design of a light control system for a theatre show controlling a bunch of Selador fixtures, based on the MaxMSP software, through a DMX interface (LanBox).

What I want to achieve is a more intuitive and gestural control of the colors than the 7 values of individual colors. I have made a stub of control system based on HSL, that converts these 3 parameters to the 7 color values. This allows me, e.g. to control the color of the fixture with a graphic tablet, or in interaction with sound, stage gesture, or whatever else able to feed my software...

Though, the maths have been made in a *very* empirical way, and I was wondering if there were any "official" (or unofficial) calculations, formulas, or charts to convert from RGB and/or HSL to the selador scheme ?

Also, if spectrum charts (e.g. wavelength/intensity) were available for each color of the fixtures, I would be very interested to have a look on them...


Hint on this, anyone ?

BTW, was my description of the problem clear enough ?




Pascal Baltazar

Intermedia Composer, France

All Replies

Not Ranked
6 Posts

Did you ever find an answer to this questions?

Top 200 Contributor
49 Posts


i'm using seladors too

i don't know a scheme where to find the data you are searching for.

the only helpful thing could be the selador application for android an ios phone. You can search for "ETC Selador" in the appstore.

there you find the values for each Gel in the fixture.


hope you still needed that help


Not Ranked
4 Posts

Hi and thanks to both of you for your answers !

Well, yes and no, I have found answers to these questions:

I didn't find any ready-made scheme or anything. And finding values for each gel (as in the iPhone app you mention, or with the Excel spreadsheets ETC provides) wasn't useful for me, because I didn't want to work in this way, but rather in a more intuitive manner, by picking colors visually. 

So, as we had a collaboration with a research center around this project, I asked them to analyze the spectrum of each LED of the fixture.

Which they did, and then they developed an algorithm to determine the best value mix for each of the 7 LEDs for any desired color.

Instead of using HSL or RGB, as I initially requested, they worked with the CIE 1931 colorspace, which BTW showed up being more interesting... (in particular being able to use the "line of black bodies" was very helpful to match other fixtures colors, such as neon tubes or incandescent bulbs...) 

I haven't asked what is the publicity of all this, but I can.

There will also be an online publication reporting this work process in about one month. I can post the link here if anyone is interested.



Top 200 Contributor
49 Posts


I'm sure you are the only one, who ever choose that way ;)

Very interested in the publication.

Not Ranked
4 Posts

here is the publication : http://www.atelier-arts-sciences.eu/images/stories/ATELIER/PDF/cahier-ecorce-du-vent.pdf

the part concerning the Selador analysis/Control is from page 21 to 26

(english version on the right side...)

have a nice read



Not Ranked
1 Posts


I'd like to read the article but the link does not work.



Not Ranked
4 Posts

Apparently the link has changed, here is the new one : http://www.atelier-arts-sciences.eu/IMG/pdf/cahier-ecorce-du-vent.pdf

Though this is not really an article, more a discussion between a scientist and an artist (me)

Hope it'll interest you...



Page 1 of 1 (8 items) | RSS
Powered by Community Server (Commercial Edition), by Telligent Systems