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You might indicate the exact version of your OS, just to see which one of us can help. I'm a Mac user.
Im guessing that this is due to the more efficient Adobe lossless compression that is applied to your Leica DNGs once youve made an adjustment and applied it to the file. And if Im correct, then removing the adjustment would not restore the original file size since the compression had already been applied.
You have your preferences set to update the embedded DNG previews (which is not the default value for that settings by the way, so you must have changed it).
This requires the DNG file to be rewritten, and we always use lossless compression when doing so (because there is not good reason not to use lossless compression). No image data has been lost, it has just been losslessly compressed.
Thank you, Ramón. My apologies for not including XP SP2 as my OS.
Thank you Greg and Thomas. Evidently I have changed the default setting for the embedded previews update when following a tutorial from the lynda.com site.
The extra lossless compression is excellent news also as I am quickly building a large number of files as I learn the camera and software.
I am very surprised as I thought that the original Raw files were not ever altered at all, except for the edit information being stored with them. However I understand your explanation. This particular camera stores its files which start as 16 bit, effectively 14 bit, in an unusual way so that they are temporarily compressed to be 8 bit then re-expanded with very little loss of data.
The important information for me of course, is that there is no loss of data by the efficient lossless compression in ACR.