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Create cross-platform RAW color corrections in Photoshop Apps
I am an avid photographer and have a Canon 10D camera. I shoot in only RAW data mode, because the picture quality is so much better. After shooting about 140 photos one weekend, I color corrected them all on a PC. I proceeded to bring them home and put them on my Mac. Much to my frustration, the Mac version of Adobe CS would not register any data associated with the color corrections I had spent so much time on. I found out that this is because the PC uses some odd side-file with a .HTM extension (I believe). Anyway, since I have a Mac and a PC and wanted to store my photos on a network box accesible by both, I needed a new solution. I found one, and it works great. Here it is...

Open up a RAW image file in Adobe CS on the Mac or PC. When the window comes up, there is a radio button that says Normal or Advanced. Set it to Advanced. Now go to the little arrow button next to the Settings drop-down menu and select Preferences. When the next window comes up under the drop-down menu that says "Save image settings in," choose the one that says Sidecar '.xmp' files. Then just hit Okay, and cancel the RAW window.

Now when you open your next RAW file and make your color corrections, it will create a separate file with that photo that will be automatically recognized on the Mac or PC version of CS. Hope this helps someone!
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Create cross-platform RAW color corrections in Photoshop
Authored by: bryanchang on Mar 15, '05 11:33:47AM

The poster of this hint misunderstood the design of the File Browser in Photoshop CS: The adjustments made to his RAW images are always stored in Photoshop's local cache folder, unless he changes the prefs to store those information in the .xmp sidecar files.

If you use Photoshop CS on more than one computer, remember to change the settings in the prefs so it always store the changes to the .xmp file.

Also the ".THM" (not .HTM) files are thumbnail files generated by his Canon 10D, not by Photoshop.

Another thing you can also do is the export the file browser preview icon cache, (the command is located in File Browser's File menu.) By doing so the preview icons will be also stored in the folder that contains the RAW files. Next time when you open this folder on another computer's Photoshop CS File Browser, it will show the previews very quickly.

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Why RAW?
Authored by: goatbar on Mar 15, '05 01:10:28PM

Hi All,

Could someone please explain to my why everyone is so excited about the RAW format? Why not use 16bit per channel tiff with lossless compression? Any if you need to save all the camera parameters, there can be tags for just about anything. Tiff can even save multiple frames in a file so you could save a dark current image and a list of bad pixels. Wasn't this the whole idea of a tagged image file format (tiff)? Also, you could easily save raw dn levels in a tiff plus the color response functions.

Please set me straight!

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Why RAW?
Authored by: lrosenstein on Mar 15, '05 01:54:35PM

RAW format captures all the information the camera has without any processing. Most cameras only capture one color channel per pixel. Producing even a 16-bit TIFF from that would require some processing in the camera.

You are right about the flexibility of TIFF, and in fact Adobe's new digital negative format is based on the TIFF standard.

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Why RAW?
Authored by: goatbar on Mar 15, '05 02:11:28PM

That makes sense. THANKS!

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Why RAW?
Authored by: Bruce Miller on Mar 15, '05 02:13:07PM

Any alteration to an image file is always destructive, especially color corrections, there is less information in the resulting file. The smaller the original file, the worse the effect (banding, posterization,) on edited output.

RAW color correction is lossless, one can even shoot grossly misadjusted color settings (tungsten shot as daylight) and recover the color as long as exposure is within parameters.

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Why RAW?
Authored by: HAL9000 on Mar 15, '05 08:12:13PM

Just to reiterate / elaborate on what the others have said, tiff files are stored after the camera has done some processing to the image, such as color balance, etc. RAW files are stored before the camera does anything to them except record them. Thus, if you trust youself to make color and sharpening corrections more than you trust your camera, RAW is useful because you're not relying on the processing power of the camera, which is likely to be not as good as the results you can get from a computer and some photoshop skill. So usually if you're talented at photoshop, or have some program that is better than the internal devices in the camera, then RAW is more useful than TIFF. But if you're not all that experienced, it can often be a good idea to let the camera do it for you.

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