RE: Re-Camera profiling
RE: Re-Camera profiling
- Subject: RE: Re-Camera profiling
- From: Roger Breton <email@hidden>
- Date: Fri, 30 Jul 2010 23:47:37 -0400
Lindsay,
All I'd like to add is, yes, capturing the target is half of the secret for
good camera profiling. The other half hinges on good camera profiling
software. I learned the hard way, a long time ago (you know who you are),
that strict colorimetric accuracy is not necessarily the best criterion for
judging the quality of a camera profile. The nature of the subject, in your
case portrait, is a more important factor. So, not all camera profiling will
be adept at "everything". Some, as I can remember, excel at preserving scene
colorimetry, while others are better suited for general kind of work. It's a
complex balancing act.
Best / Roger
> -----Original Message-----
> From: colorsync-users-bounces+graxx=email@hidden
> [mailto:colorsync-users-bounces+graxx=email@hidden] On
> Behalf Of Lindsay Merritt
> Sent: 30 juillet 2010 22:57
> To: email@hidden
> Subject: Re-Camera profiling
>
> Firstly, many thanks to all who contacted me on this list and privately.
>
> There have been many helpful suggestions and a few recommendations of
> new software and even an offer to build a custom profile for me. It's an
> awesome response.
>
> Some folks have read my use of the Kodak Grey Card as what I used to build
> the profile. It's what I used to establish exposure. I used both a GMB
> ColorChecker SG and a ColorChecker DC to use as references to build the
> profiles. Some e-mails and posts have indicated that my thinking was
flawed.
> I did also check the camera histogram with a calibrated Milnotla FLash
Meter
> 1V and they matched.
>
> This apparently was flawed thinking and the light source used far too soft
so
> thanks to the responses, I'm revisiting that approach.
>
> The profile I wish to build has to achieve only two things:
>
> 1. Be accurate purely for my "calibrated" studio situation. This is for
studio
> portraiture only.
> 2. Be used as an input profile for Capture One V5
>
> One response has given me several options which I'm trying to work out
> (thanks Sebastian). I need to get into C1 a little more to establsih
exactly
> what parameters I'm setting for the linear gamma output file.
>
> One suggestion has been to adjust the colour within Capture One. I did try
> that, spent a day on it as that should have worked. The skin tones are so
bad,
> that I couldn't adjust it out. They are a fluorescent orange and very
contrasty.
>
> As my Canon 30D, 40D, 5D and 5DMkII provide excellent results with my
> standard exposures, lighting and C1 standard input profiles, I can only
> assume that the default Canon 7D is very poorly created by Phase One, or
my
> sensor is faulty...
>
> You might ask why I insist on using the 7D. My 30D, 40D have died from the
> floggings they get and I like to use a cropped sensor in the studio for
the
> work I do. I get slightly better depth of focus than from my "full frame"
> Canons. The 7D purchase was meant to replace the dead or dying 30D and
> 40D.
>
> Ideally, I'd like to be able to learn to create these camera profiles for
myself.
> I've spent thousands over the years on CM hardware and software and
> hundreds of hours learning to use it and apply the fruits of my labour.
>
> I did end up getting the Match Phrase from ColorEyes 20/20 and I did
> download a trial copy of the BasICColor Input application as suggested. I
do
> believe my battle though, is to provide the software with an ideal target,
> perfectly created and exposed. I also need to work out how to provide the
> software (plural) with the correct *type* of file.
>
> Again, thanks to all. I may ask more questions as I try some of your
> suggestions. I hope that will be OK.
>
> Cheers,
>
> Lindsay :)
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