Now Here! Support for the Canon PowerShot G1

After much trial and error, I have figured out how to support the Canon PowerShot G1.
I started with the settings for the hacked un-supported G2 (thanks to user jpugsley for this message: http://discussions.apple.com/thread.jspa?threadID=262930). Then I read the source code to the open source dcraw.c command line raw convertor. There I found Adobe's translation values for the G1 which has a CYGM filter array. I'd say this opens up opportunities for many other CYGM cameras to be supported.
The premul values seem to affect the color balance of the images. Adjusting the values very slightly may be helpful. I don't know what most of the other values are. The m2 array values came from dcraw.c You probably shouldn't touch those.
The images seem to open fine in Preview and Aperture. I hope Apple officially supports this camera soon (Aperture 1.1?).
How To:
All you have to do is paste the following XML into this file (make sure you save a backup of the file first). Rebooting is NOT needed:
/System/Library/Frameworks/ApplicationServices.framework/Frameworks/ImageIO.fram ework/Versions/Current/Resources/Raw.plist
<key>Canon-PowerShot G1</key>
<dict>
<key>blackReplace</key> <true/>
<key>black</key> <integer>32</integer>
<key>max</key> <integer>1023</integer>
<key>white</key> <integer>1023</integer>
<key>premul0</key> <real>1.00</real> <key>premul1</key> <real>1.2</real> <key>premul2</key> <real>1.1</real> <key>premul3</key> <real>1.11</real>
<key>m1</key>
<array>
<real>1.0507</real> <real>-0.4281</real> <real>-0.0161</real>
<real>-0.5540</real> <real>1.2938</real> <real>0.2909</real>
<real>-0.1205</real> <real>0.1844</real> <real>0.8335</real>
<real>-0.1566</real> <real>1.1051</real> <real>0.0577</real>
</array>
<key>m2</key>
<array>
<real>-0.4778</real> <real>0.9467</real> <real>0.2172</real>
<real>0.4743</real> <real>-0.1141</real> <real>0.4344</real>
<real>-0.5146</real> <real>0.9908</real> <real>0.6077</real>
<real>-0.1566</real> <real>1.1051</real> <real>0.0577</real>
</array>
<key>mc</key> <real>0.83355</real>
<key>otrc</key>
<array>
<real>0.00</real> <real>0.090</real> <real>1.467</real> <real>0.260</real> <real>1.842</real> <real>0.652</real> <real>1.040</real> <real>0.538</real>
</array>
</dict>

This is stellar.
Thanks. It wasn't as hard as I thought it would be... I didn't think it was possible at first.
is this in fact all
there is to supporting a new camera RAW format --
providing a translation array in a plist file?
What follows is pure speculation... I really don't have a solid understanding of this at all.
Seems like all you have to do is get these Camera->XYZ trans values (trans may stand for transform or translate). The image is essentially monochrome with color filters over it. Some cameras use RGB filters, looks like Apple has supported a lot of those. Some are CYGM, so far Apple hasn't supported any of those. Apple has supported the Sony DSC F828 which is RGBE where E stands for Emerald. Total guess, but each set of three values in the m2 array is associated with a color. (9 total for RGB and 12 for CYGM and RGBE). Guessing, each of these sets of three values probably is used to calculate a response curve for each color.
Basically, when dcraw.c provided twelve values, I began to poke around Raw.plist and discovered the Sony F828 camera also had 12 values in its m2 array. It also had 4 premul (pre-multiplier) values, one for each set of 3 m2 values. So I took a leap of faith that CYGM could be supported because after all, a color is just a color. Does the computer really care if the value represents emerald or magenta? This produced a promising image but color was way off. I had to then tweak each premul value to bring the color in. Those values don't seem to be linear. A minor adjustment can either dramatically change everything or have no noticeable effect.
Are all RAW formats essentially supported via simply a
declarative filter array, or did it just happen to
work for G1 RAW, and other formats are different?
My amateur guess is many cameras are similar and a few stand out as different. For example, I'm guessing the Foveon cameras are an example of a different sort of RAW file. Thats just a guess based on looking at dcraw.c.
if this is all there is to
supporting a new RAW format, I wonder
- why more of the RAW formats weren't supported in the first place.
To get you to buy a fancy new camera on the Apple Store? Lazyness? Not enough time? Lack of cooperation from the manufacturer? All of the above?
- why RAW formats haven't been progressively added
since the Aperture release.
Seems like they could have had support for dozens of additional cameras. This took me only a matter of hours to figure out. Someone with a deep understanding could have done this in minutes.
The real time sink is when you almost have the colors correct and you are endlessly tweaking trying to get them perfect... as you will see, the colors will be fine in certain exposures and way off in others. Look at daylight vs. tungsten photos. It may take many hours to get the values of the camera correct to customers exacting standards. We, the photographers, are very picky.
Why don't we just contact Canon, Nikon, etc. and get
their translation values?
There are values for 83 additional cameras that aren't supported by Apple in the dcraw.c file. That's a place to start.

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