Re: Camera RAW File conversion
Re: Camera RAW File conversion
- Subject: Re: Camera RAW File conversion
- From: bruce fraser <email@hidden>
- Date: Tue, 13 Jul 2004 11:00:05 -0700
At 12:11 PM -0500 7/13/04, Mark Buckner wrote:
As for profiling through ACR, I can't understand how that would work, since
as it has been explained to me ACR mixes up a combination between two
different "secret" internal profiles, and does so differently from image to
image.
Yes, that's called white-balancing. It's a raw image. Setting white
balance (not gray balance-you can't gray-balance color filter array
cameras) in the camera just writes a tag in the metadata that may or
may not be readable by raw converters other than the vendors'. It
does nothing to the captured pixels. The raw converter needs to apply
the white balance.
That seems to me like trying to build a profile for an Epson printer
without turning off Epson's auto adjustments in their driver... Trying to
hit a moving target.
See above.
The Calibrate controls in ACR adjust the primaries of camera RGB
while maintaining the neutrals (which are of course determined by the
white balance). No more, no less, no moving targets, no auto
adjustments unless you ask for them. Just white-balancing, which you
agree is critical.
I don't see any real need to profile on top of ACR, because when the
calibrate controls are tweaked correctly for the camera (btw, I still
need two tweaks, one for full-spectrum lighting, one for tungsten),
the color produced by ACR is usually dead-nuts in the chosen working
space. But it's no different than profiling on top of any other raw
converter after white balance has been imposed on the image.
Profiling on top of a raw converter before imposing white balance is,
I think we both agree, an exercise in futility.
--
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