If you want to use Apple Aperture to process M8 DNG's you'll need to do the following.....
1. I downloaded the free Adobe DNG Converter app (ADC) from Adobe's website. Using The settings to use for the converter (available in the ADC's preferences) were:
JPEG Preview->None
Compression(Lossless) checked
Image Conversion Method->Preserve Raw Image
Original Raw File->Embed Original Raw File->unchecked
You'll also need to point to the source M8 DNG folder and where you want to output the Adobe DNG's to
2. If you try to import an Adobe converted M8 dng file into Aperture. It imports, but says that it is an unsupported image format. You'll need to do the following...
3. I started up my plist-editing application. I used PlistEdit Pro. You can download it as a free trial
4. In the finder, I navigated to
System/Library/Frameworks/ApplicationServices.framework/ Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/Raw.plist and copied (not moved) that file to the Desktop in case I made a mistake. I then opened the original file in its original location in PlistEdit Pro. You may have to unlock this file to allow you to save it depending on your security setup. To unlock right click and select get info, go to ownership and permissions and change from read only to read and write.
5. After opening in PlistEdit Pro I found the entry for the Nikon-D200 in the upper panel, highlighted it and clicked on duplicate. A new entry is created called Nikon-D200 2. If you click on the name and edit it to read Leica Camera AG-M8 Digital Camera, the name must be entered exactly as I have typed it here. It's probably easiest to cut and paste it
7. I saved the edited Raw.plist file in its original location, closed all my apps, started up Aperture, and imported the Adobe converted DNGs without a hitch.
What you will find is aperture is able to display and edit the Adobe converted DNG file like any other raw file. The only thing you may notice is the colour saturation will need to be increased slightly if you happen to like the what I consider over saturated C1 profile.
I find the conversions to be excellent and what's more I'm enjoying being back within the Aperture workflow.
I'd recommend keeping all your original M8 DNG's safe for use when ever apple provide proper M8 DNG support within OSX.
Sorry I thought you guys knew about this already, hope it helps.
The DMR file I can't get to work, looking at the file I can't seem to identify the strings that hold the image dimensions either before or after the Adobe DNG conversion. I suspect this is the issue with Aperture that it can't decode the image due to the missing info.