In my experience, the iPad does not show you the jpg and RAW separately. It tells you both are there, but you can't delete one or the other. I should add that my experience involves shooting RAW and jpg at the same time, though, and both automatically come over from the camera. As I think about, I don't actually know what happens if you upload RAW-only files to the iPad. I'd predict you can't delete the jpg thumbnail that the iPad creates, but I haven't tried that.
here are my observations, based on importing JPEG and RAW files from an EOS 40D using the CCK (I assume RAW files from other cameras behave same...)
- if you shoot RAW+JPG, when you first connect the camera, "RAW+JPG" is superimposed on a single icon for each image/pair when first displayed in the iPad (this is in the screen showing the images
before importing) i.e. you don't see separate icons for the RAW and JPG versions, but it's clear you have both. Selecting the RAW+JPG item and importing will result in both .jpg and .cr2 files to be loaded into the iPad
- if you have a RAW-only file, it appears in the import screen without any superimposed designation. in other words, it is indistinguishable from a JPEG-only image at this point.
*** once you actually import the images, the appearance of the photos changes slightly. Once you go to the "Last Imported" or "All Imported" or Events album containing your photos, the superimposed text on the RAW+JPEG file no longer appears. all your images whether JPEG, RAW+JPEG or RAW have normal unlabeled icons.
- for RAW files, the iPad creates a scaled down JPEG version which can be used or viewed on the iPad. in my case, an original 3888x2592 image was scaled to 1936x1288 (as viewed on the iPad using PhotoPad, a photo editing app)
- curiously, the JPEG only file seems scaled slightly differently. 3888x2592 original shows as 2048x1364 on the iPad
- all original full size files can be recovered from the iPad e.g. to the Mac using Image Capture or Aperture or iPhoto.
- on the iPad, if you delete a photo that was originally imported as RAW+JPEG, you delete both versions of the image.