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A630 RAW question

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Offline Bahazzie

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A630 RAW question
« on: 12 / August / 2010, 15:52:14 »
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I really like CDHK RAW, I can do amazing things in it with my A630. However the one thing that bugs me is color consistency. I can get *excellent* colors with tweaks. However the problem is that every picture needs it's own tweaks. Some info:

- I use A630 latest CDHK with DNG raw format (profile embedded)
- CS3 with ACR 4.6
- Straight from the defaults there is a reddish/magenta cast
- Reds are too strong

First question: now I tried to use the camera calibration tab, to reduce reds, but that doesn't always remove the reddish glow. How can I get better color consistency? Since the camera profile is embedded in the DNG I cannot assign another profile. Second question: I have the feeling that the "tint" while balance slider is of for a value of 10, correct?

Bas






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Offline DavidB

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Re: A630 RAW question
« Reply #1 on: 12 / August / 2010, 17:33:49 »
Quote from: Bahazzie on 12 / August / 2010, 15:52:14
First question: now I tried to use the camera calibration tab, to reduce reds, but that doesn't always remove the reddish glow. How can I get better color consistency? Since the camera profile is embedded in the DNG I cannot assign another profile.
Well, yes you can. As of ACR 4.5 you've had the ability to define custom profiles for your cameras.
See DNG Profiles at labs.adobe.com (free registration required). Adobe provided the free DNG Profile Editor, and X-Rite have provided the ColorChecker Passport which is a neatly packaged product that I use all the time.
OSX and Windows only, but if you're using CS3 already then presumably that isn't a problem for you.

If you have access to a ColorChecker target (Passport or the older versions) you can take photos of it in several specific lighting conditions and produce a "dual-illuminant" profile, make that the Camera Raw default for your camera, and hopefully your problem is solved!


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Second question: I have the feeling that the "tint" while balance slider is of for a value of 10, correct?
That all depends on the colour of the light you're trying to compensate for. If you have something in your picture that should be "neutral" you can use the white-balance dropper to pick the appropriate temp/tint values to make it neutral, but if other colors in your image are still screwy after that you definitely need a better profile. See the built-in defaults (e.g. Daylight/etc) for values that should work with standard profiles.
« Last Edit: 12 / August / 2010, 17:36:49 by DavidB »
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Offline Bahazzie

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Re: A630 RAW question
« Reply #2 on: 14 / August / 2010, 09:18:38 »
Thanks for the tip. I looked at the DNG profiles, unfortunately there is none for the A630. I tried to modify the name of the S70 profile into "Canon Powershot A630" (just to see what it would do) but it doesn't show up under the calibration tab. I only see "embedded".

The X-rite tool looks interesting, maybe for later, at the moment I have no plans to invest. The idea to have the same colors and workflow across camera's sounds very cool.

I am slightly disappointed that I have to "invent the wheel" for the A630, I was hoping others had already done so :-)
It's also not helping that the AWB of the A630 is a bit inaccurate compared to my S80 (broken) and Ixus 40 and 400D.

Bas
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Offline vit40

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Re: A630 RAW question
« Reply #3 on: 14 / August / 2010, 10:39:41 »
Try reading this thread (starting somewhere in the middle), so I don't have to explain things once again

http://forums.adobe.com/thread/692905?tstart=0
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Offline Bahazzie

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Tested procedure for G9, it works
« Reply #4 on: 14 / August / 2010, 19:15:33 »
Thanks for the tip. Wow, this requires some detailed hacking but it works. I am now checking out on the G9 Camera Standard and Neutral profiles. Something comes out, but not very reasonable yet. WB is way off and some weird WB conversion takes place ("As shot with a tint of -101???").

Ok, going to play further with it, just wanted to say thanks first.

Bas

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Offline Bahazzie

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Now trying G6 Adobe Standard beta 2 WOW!
« Reply #5 on: 14 / August / 2010, 20:53:05 »
After G9 tried G6 (Adobe Standard beta 2) and still checking, but maybe my problems are solved. Better than the JPEG's! Lots of the A630 JPEGS have that dirty yellow haze. This profile looks a lot fresher! And (contrary to G9 profile AND the embedded) the fixed WB presets look more normalish too! The superstrong purples and reds seem gone!

Good job guys and big thanks! Not completely done checking yet, but I have the feeling this gives me something to rely on.

Bas
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