P3D Re: Flash Painting

[Tom Hubin <thubin@xxxxxxxxx>]

Karen Obusek wrote:
> 
> Theatrical / stage lighting gels are sold in a variety of colors and
> densities. 2 gels can be overlapped or combined to produce color
> variations. Simply place a velcro tab on your flash, cut the gels by
> design to accomodate your flash and fire away. The gels can be used for
> color correction and color enhancement in a fill-flash application as
> well. Slaving several flashes, each using a gel variation, can create
> some surreal effects. It is also very easy to place the gels in front of
> various light sources
> ( lamps, flashlights, worklights) and compose interesting color schemes
> with this method also.
>                                            Mark Dottle

Subtractive colors vs additive colors.

When you stack gels on a single flash you are subtracting colors with
each gel. When you put single gels on seperate flashes or put them on a
single flash and flash them one at a time to create a cumulative effect
you are adding colors. 

Red, green, and blue filters on seperate light sources will add to
produce white.

Red, green (or is it yellow?) and blue filters stacked on a single light
source will absorb all light and project black.

So flashing the gels individually is very different than flashing them
stacked.

Tom Hubin
thubin@xxxxxxxxx
AO Systems Design



------------------------------