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Anonymous
n00b here,

about warming/cooling filters:
Is there a difference if I put on real filter or do it in photoshop? I guess with polarization filters one on the lens is a must. But warming/cooling?
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>> ac !!VPzQAxYPAMA
Yeah, the glass filter will cut out actual light. So you'll lose some fraction of a stop somewhere.

If you're shooting digital and using RAW, then there shouldn't be any need to use a real filter unless you actually do want to cut out actual light from the shot.
>> Anonymous
Warming/cooling filters on digital are useful only when the color temperature is fucked up, so the intensity of color channels is very disproportionate (thus equalizing them digitally to get proper WB will lead to either clipping or color noise).