ImageMagick
Warning: The 64Bit version of ImageMagick does not seem to work with PDF on Windows.
If you have dark images it is due to one of three problems:
1. Upgrade to ImageMagick 6.7.5-2 or newer 6.7.7-7. Compile with UFRaw and Tiff Library
./configure --prefix=/usr
make & make install
2. Use 8 bit for normal color levels.
3. Change the raw handling to corrent brightness
#Shows list of config files
convert --debug -list delegate
/usr/etc/ImageMagick/delegates.xml
<delegate decode="dng:decode" command=""/usr/local/bin/ufraw-batch" --silent --create-id=also --out-type=png --out-depth=8 --exposure=auto "--output=%u.png" "%i""/>
On 64bit Windows make sure you copy gswin64.exe to gswin32.exe
config
configuration
imagemagick