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
