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I can't reproduce this using ACR 4.4 and Canon RAW files, both CR2 and DNG files.
They both just act normal when changed to LAB in PSCS
Once I had a problem with the Lab colour mode in Photoshop CS3. Whenever I switched from RGB mode into Lab mode, the image would go solid-black ... albeit the single L, a, and b channels looked just fine. That had nothing to do with Camera Raw or converted raw files; it occured with JPEG or TIFF files as well. Photoshop CS2, which was installed on the same machine, did not show this issue.
I never found out the reason for that problem---but re-installing Photoshop CS3 from scratch solved the issue for me (resetting the preferences did not).
I've got this same bug and it is driving me insane! This is a major problem.
How can I revert back to ACR 4.3?
Unlike Olaf, when I completely re-installed PS3, it did not fix the problem. I'm going to try to revert to ACR 4.3 in hopes that it works. I hope the Adobe team is listening and provides a fix for this ASAP.
Upgrade to ACR 4.4.1.
Ah, okay. Whew. I was able to revert to ACR 4.3.1 by doing the following (and it fixed the bug):
- Go to http://www.adobe.com/support/downloads/detail.jsp?ftpID=3822 and download the .8bi file (e.g., download to the desktop)
- Make sure your Bridge and PS programs are closed
- Copy the downloaded .8bi file to:
\Program Files\Common Files\Adobe\Plug-Ins\CS3\File Formats
- Restart bridge, open any file in RAW, and you'll see that the version at the top of the window says 4.3.1. Open the image
- In PS3, Lab color now works properly.
Best of luck to others with this issue.
In response to Ramon's suggestion, upgrading to 4.4.1 does not alleviate the problem for me. I double checked and it still occurs so I'll stay at 4.3.1 until there's a fix.