[SML] A question about visual interpretation of RGB colors

[Jerry Durand]

Leds are very obvious point sources when viewed directly, I've seen some 
people go as far as a double reflection for a clean multi-color 
backlight (bounce LED off white reflector and then off a second).

Also, something you'll also notice is dimming.  If you're looking 
directly at the LEDs the dimming curve will be a LOT different than if 
you're looking at something they're illuminating.

But, the basic answer is LOTS of LEDs with some sort of diffusion.

On 02/23/2016 10:16 PM, Mt. Angel Performing Arts Center via Stagecraft 
wrote:
> Hi all -
>
> In my spare time I've been designing a DMX controlled 'big pixel' to 
> use on the front of our building as part of a mini-renovation.
>
> The plan was to put up a row of them along the eave line and maybe a 
> couple of other places and do some fun stuff with animating them 
> (solids, chases, etc) as part of the exterior decor.
>
> I've got the electronics working fine but getting white, red, green 
> and blue LEDs to make a visual approximation of cleanly mixed color 
> seem problematic. I am using multiples of each color of LED to get the 
> brightness I want but the individual LEDs are easily discerned rather 
> than a 'blend' of color. A translucent cap might help but would 
> certainly diminish the already dimmish output.
>
> I did one spin of the circuit board with the LEDs of each color sort 
> of interleaved or scattered ( YRGB GBYR, etc) and viewing it the 
> individual LEDs are very apparent. They're currently arranged into 
> about a 1.25x1.25" array.
>
> I'm going to experiment with another configuration and cluster each 
> color a bit closer together and grouped together and see how that 
> works out -
>
> but I'm wondering if there's any 'collective wisdom' about this sort 
> of thing.
>
> It's also possible that once I get far enough away from the LED array 
> the color will blend/mix better but that's an experiment for another day.
>
> Thanks in advance and Good Night
>
> Carla
>
> "Nothing goes from bad to worse so assuredly, as when the palsied hand 
> of bureaucracy is laid upon it."
>
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-- 
Jerry Durand, Durand Interstellar, Inc.  www.interstellar.com
tel: +1 408 356-3886, USA toll free: 1 866 356-3886
Skype:  jerrydurand