imagemagick 安装后不支持 jpeg,这是个什么情况
identify -list format
Format Mode Description
3FR r-- Hasselblad CFV/H3D39II A* rw+ Raw alpha samples AAI* rw+ AAI Dune image AI rw- Adobe Illustrator CS2 ART* rw- PFS: 1st Publisher Clip Art ARW r-- Sony Alpha Raw Image Format AVI r-- Microsoft Audio/Visual Interleaved AVS* rw+ AVS X image B* rw+ Raw blue samples BMP* rw- Microsoft Windows bitmap image BMP2* -w- Microsoft Windows bitmap image (V2) BMP3* -w- Microsoft Windows bitmap image (V3) C* rw+ Raw cyan samples CAL* r-- Continuous Acquisition and Life-cycle Support Type 1 Specified in MIL-R-28002 and MIL-PRF-28002 CALS* r-- Continuous Acquisition and Life-cycle Support Type 1 Specified in MIL-R-28002 and MIL-PRF-28002 CANVAS* r-- Constant image uniform color CAPTION* r-- Caption CIN* rw- Cineon Image File CIP* -w- Cisco IP phone image format CLIP* -w+ Image Clip Mask CMYK* rw+ Raw cyan, magenta, yellow, and black samples CMYKA* rw+ Raw cyan, magenta, yellow, black, and alpha samples CR2 r-- Canon Digital Camera Raw Image Format CRW r-- Canon Digital Camera Raw Image Format CUR* rw- Microsoft icon CUT* r-- DR Halo 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 r-- Kodak Digital Camera Raw Image File DCX* rw+ ZSoft IBM PC multi-page Paintbrush DDS* r-- Microsoft DirectDraw Surface DFONT* --- Multi-face font package DNG r-- Digital Negative 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 rw- Encapsulated Portable Document Format EPI rw- Encapsulated PostScript Interchange format EPS rw- Encapsulated PostScript EPS2* -w- Level II Encapsulated PostScript EPS3* -w+ Level III Encapsulated PostScript EPSF rw- Encapsulated PostScript EPSI rw- Encapsulated PostScript Interchange format ERF r-- Epson RAW Format 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* rw- Flexible Image Transport System FRACTAL* r-- Plasma fractal image FTS* rw- Flexible Image Transport System G* rw+ Raw green samples G3* rw- Group 3 FAX GIF* rw+ CompuServe graphics interchange format GIF87* rw- CompuServe graphics interchange format (version 87a) GRADIENT* r-- Gradual linear passing from one shade to another GRAY* rw+ Raw gray samples HALD* r-- Identity Hald color lookup table image HDR* rw+ Radiance RGBE image format HISTOGRAM* -w- Histogram of the image HRZ* rw- Slow Scan TeleVision HTM* -w- Hypertext Markup Language and a client-side image map HTML* -w- Hypertext Markup Language and a client-side image map ICB* rw- Truevision Targa image ICO* rw+ Microsoft icon ICON* rw- Microsoft icon INFO -w+ The image format and characteristics INLINE* r-- Base64-encoded inline images IPL* rw+ IPL Image Sequence K* rw+ Raw black samples K25 r-- Kodak Digital Camera Raw Image Format KDC r-- Kodak Digital Camera Raw Image Format LABEL* r-- Image label M* rw+ Raw magenta samples M2V rw+ MPEG Video Stream M4V rw+ Raw MPEG-4 Video MAC* r-- MAC Paint MAP* rw- Colormap intensities and indices MAT rw+ MATLAB level 5 image format MATTE* -w+ MATTE format MEF r-- Mamiya Raw Image File MIFF* rw+ Magick Image File Format MONO* rw- Raw bi-level bitmap MOV rw+ MPEG Video Stream MP4 rw+ MPEG-4 Video Stream MPC* rw+ Magick Persistent Cache image format MPEG rw+ MPEG Video Stream MPG rw+ MPEG Video Stream MRW r-- Sony (Minolta) Raw Image File MSL* --- Magick Scripting Language MSVG -w+ ImageMagick's own SVG internal renderer MTV* rw+ MTV Raytracing image format MVG* rw- Magick Vector Graphics NEF r-- Nikon Digital SLR Camera Raw Image File NRW r-- Nikon Digital SLR Camera Raw Image File NULL* rw- Constant image of uniform color O* rw+ Raw opacity samples ORF r-- Olympus Digital Camera Raw Image File OTB* rw- On-the-air bitmap OTF* --- Open Type font PAL* rw- 16bit/pixel interleaved YUV PALM* rw+ Palm pixmap PAM* rw+ Common 2-dimensional bitmap format PANGO* --- Pango Markup Language PATTERN* r-- Predefined pattern PBM* rw+ Portable bitmap format (black and white) PCD* rw- Photo CD PCDS* rw- Photo CD PCL rw+ Printer Control Language PCT* rw- Apple Macintosh QuickDraw/PICT PCX* rw- ZSoft IBM PC Paintbrush PDB* rw+ Palm Database ImageViewer Format PDF rw+ Portable Document Format PDFA rw+ Portable Document Archive Format PEF r-- Pentax Electronic File PES* r-- Embrid Embroidery Format PFA* --- Postscript Type 1 font (ASCII) PFB* --- Postscript Type 1 font (binary) PFM* rw+ Portable float format PGM* rw+ Portable graymap format (gray scale) PICON* rw- Personal Icon PICT* rw- Apple Macintosh QuickDraw/PICT PIX* r-- Alias/Wavefront RLE image format PLASMA* r-- Plasma fractal image PNM* rw+ Portable anymap PPM* rw+ Portable pixmap format (color) PREVIEW* -w- Show a preview an image enhancement, effect, or f/x PS rw+ PostScript PS2* -w+ Level II PostScript PS3* -w+ Level III PostScript PSB* rw+ Adobe Large Document Format PSD* rw+ Adobe Photoshop bitmap PWP* r-- Seattle Film Works R* rw+ Raw red samples RADIAL-GRADIENT* r-- Gradual radial passing from one shade to another RAF r-- Fuji CCD-RAW Graphic File RAS* rw+ SUN Rasterfile RGB* rw+ Raw red, green, and blue samples RGBA* rw+ Raw red, green, blue, and alpha samples RGBO* rw+ Raw red, green, blue, and opacity samples RLA* r-- Alias/Wavefront image RLE* r-- Utah Run length encoded image SCR* r-- ZX-Spectrum SCREEN$ SCT* r-- Scitex HandShake SFW* r-- Seattle Film Works SGI* rw+ Irix RGB image SHTML* -w- Hypertext Markup Language and a client-side image map SR2 r-- Sony Raw Format 2 SRF r-- Sony Raw Format STEGANO* r-- Steganographic image SUN* rw+ SUN Rasterfile SVG -w+ Scalable Vector Graphics SVGZ -w+ Compressed Scalable Vector Graphics TEXT* rw+ Text TGA* rw- Truevision Targa image THUMBNAIL* -w+ EXIF Profile Thumbnail TILE* r-- Tile image with a texture TIM* r-- PSX TIM TTC* --- TrueType font collection TTF* --- TrueType font TXT* rw+ Text UIL* -w- X-Motif UIL table UYVY* rw- 16bit/pixel interleaved YUV VDA* rw- Truevision Targa image VICAR* rw- VICAR rasterfile format VID* rw+ Visual Image Directory VIFF* rw+ Khoros Visualization image VST* rw- Truevision Targa image WBMP* rw- Wireless Bitmap (level 0) image WMV rw+ Windows Media Video WPG* r-- Word Perfect Graphics X3F r-- Sigma Camera RAW Picture File XBM* rw- X Windows system bitmap (black and white) XC* r-- Constant image uniform color XCF* r-- GIMP image XPM* rw- X Windows system pixmap (color) XPS r-- Microsoft XML Paper Specification XV* rw+ Khoros Visualization image Y* rw+ Raw yellow samples YCbCr* rw+ Raw Y, Cb, and Cr samples YCbCrA* rw+ Raw Y, Cb, Cr, and alpha samples YUV* rw- CCIR 601 4:1:1 or 4:2:2
- native blob support r read support w write support
- support for multiple images