Native DIMG Loaders status (Gilles Caulier - 2011-06-21)
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Format  Read  Write  ICC   MetaData  Thumb  8bits    16bits  depency

JPG     Done  Done   Done  Done      Done    yes      N.A     libjpeg
PNG     Done  Done   Done  Done      N.A     yes      yes     libpng
TIF/EP  Done  Done   Done  Done      Done    yes      yes     libtiff
RAW     Done  N.A    N.A   Done      Done    yes      yes     libkdcraw
PPM     Done  TODO   N.A   N.A       N.A     yes      yes     none
PGF     Done  DONE   TODO  DONE      N.A     yes      yes     libpgf (internally)
JPEG2K  Done  Done   Done  Done      N.A     yes      yes     libjasper

Others file formats are supported only in 8 bits/color/pixel using QImage/kimgio. 
Supported formats are listed below :

Format   Read       Write      Remarks

PSD      yes        no         Photoshop file format
EXR      yes        no         OpenEXR (libopenexr)
XCF      yes        no         Gimp file format
PBM      yes        yes
PGM      yes        yes  
PPM      no         yes
TGA      yes        yes
PCX      yes        yes
BMP      yes        yes        Win32 bitmap format
RGB      yes        yes
XBM      yes        yes
XPM      yes        yes
EPS      yes        yes
DDS      yes        no
ICO      yes        no         Win32 icon format
MNG      yes        no
GIF      yes        no

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TODO :

Add WebP support using http://code.google.com/speed/webp

