I wrote to Canon about the fact that when you use the CPPL plugin in Lightroom it opens a Pro Photo 300dpi file as Adobe 1998 and 240dpi.
If you send the exact same file via the Photoshop plugin it opens a Pro Photo 300dpi file.
This is Canon's response in case anyone is interested.
"Hello William,
Here is a response from Canon Inc.:
--
Unfortunately, Lightroom didn't offer a way to fully implement the workflow user want.
This is primarily due to the specifications of Lightroom and, in turn, the specifications that PPL has to deal with.
I can't tell you much about the internal specifications because of confidentiality with Adobe, but when Lightroom reads RAW data, Rightroom manages the data in its own file format.
Since that format is not readable by the PPL, the PPL tells Lightroom to pass the data to Lightroom, specifying the maximum format and color space that the PPL can read, AdobeRGB.
However, the resolution cannot be specified by the PPL and is emitted at a fixed 240dpi.
So that's the internal behavior.
As for the color space, if user imports from RAW data, there is no information unless user develops it once in Lightroom, so PPL has to choose Adobe RGB, but user don't have to worry about the resolution.
Even if Lightroom exports at 240dpi, PPL assigns that to a frame that you specify, so the resolution that Lightroom exports doesn't degrade the image.
Because the number of pixels contained in the exported data does not matter how many DPI it is.
Therefore, if resolution is important to use, please tell them that user can ignore this.
If user is particular about the color space from RAW data, consider applying Digital Photo Professional (DPP)
(Note : Only to Canon camera data)."
