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| p.1 #6 · p.1 #6 · Natural Light + Strobe + LED (Blue) lighting Help |
When you said "environmental lighting (natural)", I assumed/inferred you are talking about window or skylight. Is this the natural that you were referring?
+1 @ shoot ambient only ... i.e. don't mix light sources of natural ambient and flash (unless your ambient can be at the time of day/orientation that is nearly the same temp as flash ... or you gel your flash to match).
Then you are only trying to determine the correct WB for one light source ... and the "blue" of the artwork is supposed to be blue. As Brian mentions, you can also overpower the ambient with flash ... but that won't give the ambiance of the natural lighting that you've said your client wants, unless you can create a very large source for your flash.
If you do mix light sources, I would consider orienting my flash from the same direction as the natural light so they have a more homogenous effect where the key/shadow/fill are of the same color rather than having some areas be ambient, some flash and some a blend of the two. That or I would use the flash as underpowered omni-fill, so the natural light color overpowers the flash.
While it might seem pedantic, mixing two colors of light will yield three colors in various areas of the scene when they are at cross axis. For many applications, this isn't something that presents a significant issue, but for the artwork ... I stick with ONE COLOR of light source(s) if at all possible.