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| p.1 #4 · Portrait exposure question |
+1 @ mixed lighting influence.
Curious @ how you were assessing / determining your WB?
One thing to note about using flash for a balanced exposure with ambient ... it means that your exposure is partly coming from flash and partly coming from ambient so the two add up to a given exposure value.
All good if the two color sources are the same temp (such as with flash balanced to daylight while shooting in daylight). However, if you are shooting in mixed light (mixed color lighting) of flash (daylight) + incandescent/tungsten (warm) then it becomes part flash (daylight) + tungsten (warm) = something in between in those areas that the light sources are blended.
So, you can wind up with three different WB's (or a gradient @ falloff) in the same image.
1. The Blended value: where ambient and flash overlap
2. Flash: where ambient would otherwise be a shadow and only flash reaches
3. Ambient: where flash does not reach (either as a blocked/shadow, or falloff won't allow for it at a distance, such as the background
Accordingly, it requires a study of the light being received from flash, ambient and blend before you assess the WB. Unfortunately, LR or PS or others are making an ASSUMPTION that the image has a SINGLE WB value. Based on that assumption, Auto will almost always be WRONG when you have mixed lighting as such.
The correction @ time of shoot is to gel / match your flash color to your ambient color (even if only closer) as already mentioned. That or you can overpower ambient so that you retain the majority of WB influence @ your flash WB, but then you aren't balancing ambient / flash exposure anymore, so it kinda cuts both ways. You just have to be aware as to which color of light you are illuminating the various portions of your scene with and adjust in PP accordingly if they aren't uniform, i.e. mixed lighting.
If we look at the two sleeves, we can see the color diff pretty readily as one is illuminated by more flash than the other (falloff), as well as the directional aspect of the ambient where it reaches/doesn't reach. The same applies to the hair color variation as well.
My strategy is to neutralize the subject's eyelashes for the shadow values and neutralize the specular highlight of her earring for highlight values ... then leaving the stronger ambient influences to fall as they may for kicker / accent (although they could be corrected independently as well).
Edited on Apr 09, 2014 at 01:56 AM · View previous versions