Imagemagick can read NEF files to output jpeg or a wide range of other formats.
- Free/Gratis
- Cross platform
- Command Line conversion
- Batch conversion
- Lots of input & output formats:
~$ identify -list format Format Module Mode Description
3FR DNG r-- Hasselblad CFV/H3D39II
A* RAW rw+ Raw alpha samples
AAI* AAI rw+ AAI Dune image
AI PDF rw- Adobe Illustrator CS2
ART* ART rw- PFS: 1st Publisher Clip Art
ARW DNG r-- Sony Alpha Raw Image Format
AVI MPEG r-- Microsoft Audio/Visual Interleaved
AVS* AVS rw+ AVS X image
B* RAW rw+ Raw blue samples
BGR* BGR rw+ Raw blue, green, and red samples
BGRA* BGR rw+ Raw blue, green, red, and alpha samples
BIE* JBIG rw- Joint Bi-level Image experts Group interchange format (2.0)
BMP* BMP rw- Microsoft Windows bitmap image
BMP2* BMP -w- Microsoft Windows bitmap image (V2)
BMP3* BMP -w- Microsoft Windows bitmap image (V3)
BRF* BRAILLE -w- BRF ASCII Braille format
C* RAW rw+ Raw cyan samples
CAL* CALS rw- Continuous Acquisition and Life-cycle Support Type 1
Specified in MIL-R-28002 and MIL-PRF-28002
CALS* CALS rw- Continuous Acquisition and Life-cycle Support Type 1
Specified in MIL-R-28002 and MIL-PRF-28002 CANVAS* XC r-- Constant image uniform color CAPTION* CAPTION r-- Caption
CIN* CIN rw- Cineon Image File
CIP* CIP -w- Cisco IP phone image format
CLIP* CLIP -w+ Image Clip Mask
CMYK* CMYK rw+ Raw cyan, magenta, yellow, and black samples
CMYKA* CMYK rw+ Raw cyan, magenta, yellow, black, and alpha samples
CR2 DNG r-- Canon Digital Camera Raw Image Format
CRW DNG r-- Canon Digital Camera Raw Image Format
CUR* CUR rw- Microsoft icon
CUT* CUT r-- DR Halo
DCM* DCM r-- Digital Imaging and Communications in Medicine image
DICOM is used by the medical community for images like X-rays. The
specification, "Digital Imaging and Communications in Medicine
(DICOM)", is available at http://medical.nema.org/. In particular,
see part 5 which describes the image encoding (RLE, JPEG, JPEG-LS),
and supplement 61 which adds JPEG-2000 encoding.
DCR DNG r-- Kodak Digital Camera Raw Image File
DCX* PCX rw+ ZSoft IBM PC multi-page Paintbrush
DDS* DDS r-- Microsoft DirectDraw Surface
DFONT* TTF r-- Multi-face font package (Freetype 2.5.2)
DJVU* DJVU r-- D�j� vu
See http://www.djvuzone.org/ for details about the DJVU format. The
DJVU 1.2 specification is available there and at
ftp://swrinde.nde.swri.edu/pub/djvu/documents/.
DNG DNG r-- Digital Negative
DOT DOT --- Graphviz
DPX* DPX rw- SMPTE 268M-2003 (DPX 2.0)
Digital Moving Picture Exchange Bitmap, Version 2.0.
See SMPTE 268M-2003 specification at http://www.smtpe.org
EPDF PDF rw- Encapsulated Portable Document Format
EPI PS rw- Encapsulated PostScript Interchange format
EPS PS rw- Encapsulated PostScript
EPS2* PS2 -w- Level II Encapsulated PostScript
EPS3* PS3 -w+ Level III Encapsulated PostScript
EPSF PS rw- Encapsulated PostScript
EPSI PS rw- Encapsulated PostScript Interchange format
EPT EPT rw- Encapsulated PostScript with TIFF preview
EPT2 EPT rw- Encapsulated PostScript Level II with TIFF preview
EPT3 EPT rw+ Encapsulated PostScript Level III with TIFF preview
ERF DNG r-- Epson RAW Format
EXR EXR rw- High Dynamic-range (HDR)
FAX* FAX rw+ Group 3 FAX
FAX machines use non-square pixels which are 1.5 times wider than
they are tall but computer displays use square pixels, therefore
FAX images may appear to be narrow unless they are explicitly
resized using a geometry of "150x100%".
FITS* FITS rw- Flexible Image Transport System FRACTAL* PLASMA r-- Plasma fractal image
FTS* FTS rw- Flexible Image Transport System
G* RAW rw+ Raw green samples
G3* FAX rw- Group 3 FAX
GIF* GIF rw+ CompuServe graphics interchange format
GIF87* GIF rw- CompuServe graphics interchange format (version 87a) GRADIENT* GRADIENT r-- Gradual linear passing from one shade to another
GRAY* GRAY rw+ Raw gray samples GROUP4* TIFF rw- Raw CCITT Group4
HALD* r-- Identity Hald color lookup table image
HDR* HDR rw+ Radiance RGBE image format HISTOGRAM* HISTOGRAM -w- Histogram of the image
HRZ* HRZ rw- Slow Scan TeleVision
HTM* HTML -w- Hypertext Markup Language and a client-side image map
HTML* HTML -w- Hypertext Markup Language and a client-side image map
ICB* TGA rw- Truevision Targa image
ICO* ICON rw+ Microsoft icon
ICON* ICON rw- Microsoft icon
INFO INFO -w+ The image format and characteristics INLINE* INLINE r-- Base64-encoded inline images
IPL* IPL rw+ IPL Image Sequence ISOBRL* BRAILLE -w- ISO/TR 11548-1 format
J2C* JP2 rw- JPEG-2000 Code Stream Syntax
J2K* JP2 rw- JPEG-2000 Code Stream Syntax
JBG* JBIG rw+ Joint Bi-level Image experts Group interchange format (2.0)
JBIG* JBIG rw+ Joint Bi-level Image experts Group interchange format (2.0)
JNG* PNG rw- JPEG Network Graphics
See http://www.libpng.org/pub/mng/ for details about the JNG
format.
JP2* JP2 rw- JPEG-2000 File Format Syntax
JPC* JP2 rw- JPEG-2000 Code Stream Syntax
JPEG* JPEG rw- Joint Photographic Experts Group JFIF format (80)
JPG* JPEG rw- Joint Photographic Experts Group JFIF format (80)
JPX* JP2 rw- JPEG-2000 File Format Syntax
K* RAW rw+ Raw black samples
K25 DNG r-- Kodak Digital Camera Raw Image Format
KDC DNG r-- Kodak Digital Camera Raw Image Format
LABEL* LABEL r-- Image label
M* RAW rw+ Raw magenta samples
M2V MPEG rw+ MPEG Video Stream
M4V MPEG rw+ Raw MPEG-4 Video
MAC* MAC r-- MAC Paint
MAP* MAP rw- Colormap intensities and indices
MAT MAT rw+ MATLAB level 5 image format
MATTE* MATTE -w+ MATTE format
MEF DNG r-- Mamiya Raw Image File
MIFF* MIFF rw+ Magick Image File Format
MNG* PNG rw+ Multiple-image Network Graphics (libpng 1.2.50)
See http://www.libpng.org/pub/mng/ for details about the MNG
format.
MONO* MONO rw- Raw bi-level bitmap
MOV MPEG rw+ MPEG Video Stream
MP4 MPEG rw+ MPEG-4 Video Stream
MPC* MPC rw+ Magick Persistent Cache image format
MPEG MPEG rw+ MPEG Video Stream
MPG MPEG rw+ MPEG Video Stream
MRW DNG r-- Sony (Minolta) Raw Image File
MSL* MSL rw+ Magick Scripting Language
MSVG SVG rw+ ImageMagick's own SVG internal renderer
MTV* MTV rw+ MTV Raytracing image format
MVG* MVG rw- Magick Vector Graphics
NEF DNG r-- Nikon Digital SLR Camera Raw Image File
NRW DNG r-- Nikon Digital SLR Camera Raw Image File
NULL* NULL rw- Constant image of uniform color
O* RAW rw+ Raw opacity samples
ORF DNG r-- Olympus Digital Camera Raw Image File
OTB* OTB rw- On-the-air bitmap
OTF* TTF r-- Open Type font (Freetype 2.5.2)
PAL* UYVY rw- 16bit/pixel interleaved YUV
PALM* PALM rw+ Palm pixmap
PAM* PNM rw+ Common 2-dimensional bitmap format
PANGO* PANGO r-- Pango Markup Language (Pangocairo 1.36.1) PATTERN* PATTERN r-- Predefined pattern
PBM* PNM rw+ Portable bitmap format (black and white)
PCD* PCD rw- Photo CD
PCDS* PCD rw- Photo CD
PCL PCL rw+ Printer Control Language
PCT* PICT rw- Apple Macintosh QuickDraw/PICT
PCX* PCX rw- ZSoft IBM PC Paintbrush
PDB* PDB rw+ Palm Database ImageViewer Format
PDF PDF rw+ Portable Document Format
PDFA PDF rw+ Portable Document Archive Format
PEF DNG r-- Pentax Electronic File
PES* PES r-- Embrid Embroidery Format
PFA* TTF r-- Postscript Type 1 font (ASCII) (Freetype 2.5.2)
PFB* TTF r-- Postscript Type 1 font (binary) (Freetype 2.5.2)
PFM* PFM rw+ Portable float format
PGM* PNM rw+ Portable graymap format (gray scale)
PGX* JP2 r-- JPEG-2000 VM Format
PICON* XPM rw- Personal Icon
PICT* PICT rw- Apple Macintosh QuickDraw/PICT
PIX* PIX r-- Alias/Wavefront RLE image format
PJPEG* JPEG rw- Joint Photographic Experts Group JFIF format (80) PLASMA* PLASMA r-- Plasma fractal image
PNG* PNG rw- Portable Network Graphics (libpng 1.2.50)
See http://www.libpng.org/ for details about the PNG format.
PNG24* PNG rw- opaque 24-bit RGB (zlib 1.2.8)
PNG32* PNG rw- opaque or transparent 32-bit RGBA
PNG8* PNG rw- 8-bit indexed with optional binary transparency
PNM* PNM rw+ Portable anymap
PPM* PNM rw+ Portable pixmap format (color) PREVIEW* PREVIEW -w- Show a preview an image enhancement, effect, or f/x
PS PS rw+ PostScript
PS2* PS2 -w+ Level II PostScript
PS3* PS3 -w+ Level III PostScript
PSB* PSD rw+ Adobe Large Document Format
PSD* PSD rw+ Adobe Photoshop bitmap
PTIF* TIFF rw+ Pyramid encoded TIFF
PWP* PWP r-- Seattle Film Works
R* RAW rw+ Raw red samples RADIAL-GRADIENT* GRADIENT r-- Gradual radial passing from one shade to another
RAF DNG r-- Fuji CCD-RAW Graphic File
RAS* SUN rw+ SUN Rasterfile
RGB* RGB rw+ Raw red, green, and blue samples
RGBA* RGB rw+ Raw red, green, blue, and alpha samples
RGBO* RGB rw+ Raw red, green, blue, and opacity samples
RLA* RLA r-- Alias/Wavefront image
RLE* RLE r-- Utah Run length encoded image
SCR* SCR r-- ZX-Spectrum SCREEN$
SCT* SCT r-- Scitex HandShake
SFW* SFW r-- Seattle Film Works
SGI* SGI rw+ Irix RGB image
SHTML* HTML -w- Hypertext Markup Language and a client-side image map
SR2 DNG r-- Sony Raw Format 2
SRF DNG r-- Sony Raw Format STEGANO* STEGANO r-- Steganographic image
SUN* SUN rw+ SUN Rasterfile
SVG SVG rw+ Scalable Vector Graphics (RSVG 2.40.1)
SVGZ SVG rw+ Compressed Scalable Vector Graphics (RSVG 2.40.1)
TEXT* TXT rw+ Text
TGA* TGA rw- Truevision Targa image THUMBNAIL* THUMBNAIL -w+ EXIF Profile Thumbnail
TIFF* TIFF rw+ Tagged Image File Format (LIBTIFF, Version 4.0.3) TIFF64* TIFF rw- Tagged Image File Format (64-bit) (LIBTIFF, Version 4.0.3)
TILE* TILE r-- Tile image with a texture
TIM* TIM r-- PSX TIM
TTC* TTF r-- TrueType font collection (Freetype 2.5.2)
TTF* TTF r-- TrueType font (Freetype 2.5.2)
TXT* TXT rw+ Text
UBRL* BRAILLE -w- Unicode Text format
UIL* UIL -w- X-Motif UIL table
UYVY* UYVY rw- 16bit/pixel interleaved YUV
VDA* TGA rw- Truevision Targa image
VICAR* VICAR rw- VICAR rasterfile format
VID* VID rw+ Visual Image Directory
VIFF* VIFF rw+ Khoros Visualization image
VST* TGA rw- Truevision Targa image
WBMP* WBMP rw- Wireless Bitmap (level 0) image
WMF* WMF r-- Windows Meta File
WMV MPEG rw+ Windows Media Video
WMZ* WMZ r-- Compressed Windows Meta File
WPG* WPG r-- Word Perfect Graphics
X* X rw+ X Image
X3F DNG r-- Sigma Camera RAW Picture File
XBM* XBM rw- X Windows system bitmap (black and white)
XC* XC r-- Constant image uniform color
XCF* XCF r-- GIMP image
XPM* XPM rw- X Windows system pixmap (color)
XPS XPS r-- Microsoft XML Paper Specification
XV* VIFF rw+ Khoros Visualization image
XWD* XWD rw- X Windows system window dump (color)
Y* RAW rw+ Raw yellow samples
YCbCr* YCbCr rw+ Raw Y, Cb, and Cr samples
YCbCrA* YCbCr rw+ Raw Y, Cb, Cr, and alpha samples
YUV* YUV rw- CCIR 601 4:1:1 or 4:2:2
* native blob support
r read support
w write support
+ support for multiple images
