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Archive 2009 · a850 vs a900, 1 stop better noise performance?

  
 
wayne seltzer
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p.6 #1 · a850 vs a900, 1 stop better noise performance?


Thanks theSuede, very interesting stuff.
Is there a good book that you would recommentd to read on alll this stuff?

Do you have color profiles for 1ds3 or any canon cameras to try in LR?



Dec 23, 2009 at 03:03 AM
theSuede
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p.6 #2 · a850 vs a900, 1 stop better noise performance?


That one comes from one of the first models of correction algorithms I tried, and even if it is very "correct" you might find a bit supercharged. It will pick up things you cannot see in some cases - it can be very harsh on bad complexions. But I do appreciate feedback in any case. It's a killer for florals.


Dec 23, 2009 at 03:05 AM
theSuede
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p.6 #3 · a850 vs a900, 1 stop better noise performance?


Previous post was directed at the last post on previous page
... :-)
Yes, I have the data, but I haven't run the latest batch of trials on the 7D / 1Ds3. Will do so during X-mas.

I don't have much that's actually readable outside of the scientific papers from various research institutes and my own time with Fraunhofer. Most of the stuff is highly math psychovisual oriented, not so much practical photography. Regarding practical photography I can recommend Dan Margulis' "Photoshop LAB color" which contains quite a lot of useful ideas and insights even to those not working in Lab colourspace.

DxO has a short writeup on their testing methodology and general information on how they derive their "relative metamerism index" here:
http://www.dxo.com/var/dxo/storage/fckeditor/File/embedded/2009_EI_InformationCapacity.pdf

One older version (same generation as the A900 BB profile, but not as "sharp") profile for the 7D can be found here:
http://www.mediafire.com/?mih4ytymkdg



Dec 23, 2009 at 03:21 AM
wayne seltzer
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p.6 #4 · a850 vs a900, 1 stop better noise performance?


Thanks, I have the Margulis book and found some useful stuff in there awhile ago.
The trick of steepening the curves for the A and B channels in LAB space and basically changing color without affecting luminance values is interesting. Actually I was trying to remember that trick the other day when trying to emulate the sony fingerprint color.
I need to find the book and refresh myself on some of the steps.




Dec 23, 2009 at 03:31 AM
theSuede
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p.6 #5 · a850 vs a900, 1 stop better noise performance?


That one is useful, but mainly for general balance. The fun stuff starts when you start using various masks on the ab changes... :-)

One of the other "useful" things I like about the Lab space is that you can run a large-radius unsharp mask on the ab channels and get something almost aching to "colour sharpening". This is also VERY effective from a psychovisual point of view. You can increase colour contrast without oversaturating the picture as a whole - this increases the perception of "well defined colour" quite a lot.



Dec 23, 2009 at 03:38 AM
wayne seltzer
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p.6 #6 · a850 vs a900, 1 stop better noise performance?


Do you have any presets for 1ds3 to try?


Dec 23, 2009 at 03:44 AM
wayne seltzer
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p.6 #7 · a850 vs a900, 1 stop better noise performance?


How do I install the 7d .dcp file in to LR?


Dec 23, 2009 at 04:05 AM
wayne seltzer
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p.6 #8 · a850 vs a900, 1 stop better noise performance?


How do I install the .dcp file into LR?
I am used to presets which are a LRTemplate type file.



Dec 23, 2009 at 04:42 AM
Daniel Heineck
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p.6 #9 · a850 vs a900, 1 stop better noise performance?


Joakim, as I mentioned in my PM, if you've monkeyed around with the 5D, I'll be more than happy to run your profiles through the ropes (although I doubt I have the clout to make much difference ) and I'm close to a printing run, so it'd be fun for comparison's sake.

Anyways, this has been an excellent discussion--thanks all.



Dec 23, 2009 at 04:43 AM
theSuede
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p.6 #10 · a850 vs a900, 1 stop better noise performance?


In windows XP the .dcp file goes into:
C:\Documents and Settings\*yourname*\Application Data\Adobe\CameraRaw\CameraProfiles
This folder is usually empty, the Adobe system profiles are at:
C:\Documents and Settings\All Users\Application Data\Adobe\CameraRaw\CameraProfiles
- But I recommend that you keep the LR/ACR manged profiles separate, and your personal profiles in the first folder.

Vista is at:
C:\ProgramData\Adobe\CameraRaw\CameraProfiles

Daniel; will get back to you soon... I would like to run the new algorithms with the 5D I have to phase in the new 35-colour CC board first. This will probably be during the weekend.



Dec 23, 2009 at 05:47 AM
wayne seltzer
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p.6 #11 · a850 vs a900, 1 stop better noise performance?


Sorry but where is the directory for vista 64 users using LR 2.6 64 bit?
The ones you listed above are not there.
Usually in the past I just import the profile into LR but looks like the import tool only supports LRTemplate files and does not allow selecting DCP files



Dec 23, 2009 at 12:23 PM
theSuede
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p.6 #12 · a850 vs a900, 1 stop better noise performance?


() Search the main drive for any file named *.dcp or the folder named "CameraProfiles" - include "hidden files/folders". Strange if the 64 system should have a different path for the profiles... You have to be logged in as administrator to see the "ProgramData" main folder I think.
A profile is quite a lot more than a LRTemplate, as most of it works at the picture in linear format already at the import stage, before tonecurves, exposure controls and all the other stuff...



Dec 23, 2009 at 07:32 PM
wayne seltzer
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p.6 #13 · a850 vs a900, 1 stop better noise performance?


Ok, sorry it was the windows trick of hiding the directory on me. Just typed in the directory and it showed up. The profile is much better than adobe profiles for the 7d.
I will post some pix showing the difference. Is this prifile only good for certain WB temperatures or good for all?
The profile really fixed up the colors on this odwalla juice display shot.
Thanks!



Dec 24, 2009 at 02:11 AM
theSuede
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p.6 #14 · a850 vs a900, 1 stop better noise performance?


The profile is D50-centered, target shot under filtered halogen bulbs. It might be a bit off target at incandescent (2800K) or lower (that's mostly fire/candles under 2800...) and fluorescents. But then, all fluorescents are individuals - different tubes needs different profiles. Fluorescents are the most "demanding" light of all, only the very best cameras can accurately depict fullrange colour in this light.


Dec 26, 2009 at 08:37 AM
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