Re: Camera Profiling
Re: Camera Profiling
- Subject: Re: Camera Profiling
- From: edmund ronald <email@hidden>
- Date: Thu, 29 Jul 2010 08:33:21 +0200
there are three issues here:
1 why c1 is doing so badly?
2 running the profiling workflow
3 lighting and photographing the card.
My suggestion would be to get in touch with Coloreyes as they are a
good company, and have experience in walking people through the
profiling process.
Edmund
On Thursday, July 29, 2010, Lindsay Merritt <email@hidden> wrote:
> Hi folks.
>
> OK, I know the general opinion on camera profiles and their worth but please, bear with me.
>
> I have a new Canon 7D and I use the latest version of Capture One V5 to process my raw files. I love the output of C1, have used it for many years and don't want to change.
>
> The problem is, the skin-tones I get from the 7D are just awful when processed in C1. The skin-tones could only be described as luminous orange. I've satisfied myself that this is a C1 profile issue for this camera. I did this by using a 24 patch ColorChecker card and by using both the DNG profile editor and ColorChecker Passport for ACR. The camera produces excellent results either with the standard profile or my custom one in ACR.
>
> We can shoot anything up to 15 portrait sessions a day in our studio and I need speed and reliability, hence Capture One. I don't like using ACR and LightRoom not only will nor launch on my brand new Mac Pro, I don't like the interface and dislike the external database. Trust me, Capture One and I are friends...
>
> My camera room is painted grey so as not to add color casts. My Elinchroms are gelled to match at 5250K as measured with my Minolta CT meter. We use a WhiBal reference in the first frame of every shoot. This is to allow as perfect a color rendition as possible with the least effort required in post production. This system has worked perfectly for years until now.
>
> I decided to build a custom profile for the 7D. I'd done them before when I photographed artworks with a Kodak DCS 760. The results were outstanding (and published). This process required a linear gamma tiff file. I can't remember the software I used to create the profile but I think it was made by Profile City (now defunct).
>
> I set the lighting to perfection and using a Kodak Grey Card, established the exposure with the Histogram, one line dead in the middle of the screen, double checked the exposure with Minolta Falsh Meter 1V and it matched to the tenth of an f-stop. Lighting was even (and proven so when later measured with the Eyedropper Tool in CS4).
>
> I photographed both the GMB ColorChecker DC card and the GMB ColorChecker SG card to see which would produce the best results.
>
> At this point, this is where I ran into trouble. I believed that the profile should have been created from a linear gamma, tiff file with no embedded profile and ProfileMaker was telling me that the image was too dark. It wanted a processed ProPhoto RGB tiff file. I installed Canon Digital Photo Professional in the hope that this would help but not only did I have to embed a proffile, the largest available was Wide Gamut RGB.
>
> When processed, obviously a tone curve gas been applied and the file looked normal, and what ProfileMaker was expecting but I knew that the result would not be satisfactory and was proven right. I checked the gamut volume against the Capture One standard CanonEOS7d-Generic.icm profile in ColorThink 3.0 Pro. I knew then I'd not succeeded but tried the profile out anyway. No deal.
>
> I have ColorEyes 20/20 and reinstalled that but if anyone has used that, it gives you the name of an animal and you require the match-phrase. I did that, received my match phrase and when I relaunched the application the following day, my bloody animal had changed and the match phrase no longer matched. Who knew?
>
> I've e-mailed for another match-phrase with the new animal but have not been answered. I'm sure they believe I'm attempting multiple installs...
>
> So finally, my question. What do I need to do here? I can't see that using an exported Tiff file complete with an embedded profile and tone curve applied can possibly allow me to build a profile worth a damn.
>
> Am I missing something? Is there software that will build an accurate profile from an untouched converted linear gamma TIFF file? What software (if not ProfileMaker) would Capture One be using to build *their* profiles?
>
> I can't test ColorEyes 20/20 (no match phrase) but the manual leads me to believe that I'm heading to the same dead end that ProfileMaker took me.
>
> I'd accept any advice, am happy to provide the raw files I took of the test charts etc.
>
> Anyone, please?
>
> Cheers,
>
> Lindsay Merritt M.Photog.
> About Faces Photography
> 318 Princes Highway
> Bulli. NSW.
> Australia 2516
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