Some time ago, I mentioned vignetting problem visible in RAWs (be it camera-ui ones, or fCAM), that was very hard to fix manually. Thanks to geohsia, we have FOSS fix for that! Look here:
http://talk.maemo.org/showpost.php?p...7&postcount=19
You can also find nice examples of what I've been talking about (cyan vignette).

If we're talking about RAW's, two questions:
1. geohsia stated, that fCAM RAW's are "better suited" to create vignette-deletion profiles (using them as reference image for CornerFix's algorithms). I've experimented with images using tripod - in exact same light conditions etc, one made with fCam, and another using camera-ui. Indeed, they're giving a little different results.

I know fCam uses different libraries, but shouldn't RAW (being sensor data dump) be close to identical?

2. Could anyone knowledgeable about N900 RAW's explain me that?
http://talk.maemo.org/showpost.php?p...2&postcount=29
Is it useless "ghost" thumbnail, remnant of JPG creation on N900 (from RAW, that we're using now), or is it indication of some useful, yet unused (maybe because some errors in creating .dng from our RAW) data left in RAW?