nim-imghdr is a Nim module for determining the type of an image from a given file, filename, or sequence of bytes. It can detect many common image formats. nim-imghdr is a port of Python's imghdr module.

Usage:

testImage(file : File)
testImage(filename : string)
testImage(data : seq[int8])

nim-imghdr can also be used as a command line program:

imghdr [filename1] [filename2] ...

List of detected formats:

• PNG (Portable Network Graphics) format - ImageType.PNG
• JPEG (Joint Photographic Experts Group) format (either JFIF or Exif) - ImageType.JPEG
• GIF (Graphics Interchange Format) format - ImageType.GIF
• TIFF (Tagged Image File Format) format - ImageType.TIFF
• SVG (Scalable Vector Graphics) format - ImageType.SVG
• SGI (Silicon Graphics workstation) format - ImageType.RGB
• PBM (portable bitmap) format - ImageType.PBM
• PGM (portable graymap) format - ImageType.PGM
• PPM (portable pixmap) format - ImageType.PPM
• PAM format - ImageType.PAM
• BMP (bitmap) format - ImageType.BMP
• XMB (X10 or X11 bitmap) format - ImageType.XMB
• Rast (Sun raster) format - ImageType.Rast
• CRW (Canon camera RAW) format - ImageType.CRW
• CR2 (Canon camera RAW 2) format - ImageType.CR2
• MRW (Minolta camera RAW) format - ImageType.MRW
• X3F (Sigma camera RAW) format - ImageType.X3F
• WEBP format - ImageType.WEBP
• XCF (GIMP native) format - ImageType.XCF
• GKSM (Graphics Kernel System) format - ImageType.GKSM
• PM (XV image) format - ImageType.PM
• FITS (Flexible Image Transport System) format - ImageType.FITS
• XPM (X PixMap 1 and 3) format - ImageType.XPM
• XPM2 (X PixMap 2) format - ImageType.XPM2
• PS (PostScript) format - ImageType.PS
• Xfig format - ImageType.Xfig
• IRIS format - ImageType.IRIS
• SPIFF (Still Picture Interchange File Format) format - ImageType.SPIFF
• GEM (GEM Raster) format - ImageType.GEM
• Amiga icon format - ImageType.Amiga
• TIB (Acronis True Image) format - ImageType.TIB
• JB2 (JBOG2) format - ImageType.JB2
• CIN (Kodak Cineon) format - ImageType.CIN
• PSP (Corel Paint Shop Pro) format - ImageType.PSP
• EXR (OpenEXR) format - ImageType.EXR
• CALS (CALS raster bitmap) format - ImageType.CALS
• DPX (Society of Motion Picture and Television Engineers Digital Picture Exchange image) format - ImageType.DPX
• SYM (Windows SDK graphics symbol) format - ImageType.SYM
• SDR (SmartDraw Drawing) format - ImageType.SDR
• IMG (Img Software Set Bitmap) format - ImageType.IMG
• ADEX (ADEX Corp. ChromaGraph Graphics Card Bitmap Graphic) format - ImageType.ADEX
• NITF (National Imagery Transmission Format) format - ImageType.NITF
• BigTIFF (Big Tagged Image File Format; TIFF > 4 GB) format - ImageType.BigTIFF
• GX2 (Show Partner graphics) format - ImageType.GX2
• PAT (GIMP pattern) format - ImageType.PAT
• CPT (Corel Photopaint) format - ImageType.CPT
• SYW (Harvard Graphics symbol graphic) format - ImageType.SYW
• DWG (generic AutoCAD drawing) format - ImageType.DWG
• PSD (Photoshop image) format - ImageType.PSD
• FBM (fuzzy bitmap) format - ImageType.FBM
• HDR (Radiance High Dynamic Range image) format - ImageType.HDR
• MP (Monochrome Picture TIFF bitmap) format - ImageType.MP
• DRW (generic drawing) format - ImageType.DRW
• Micrografx (Micrografx vector graphics) format - ImageType.Micrografx
• PIC (generic picture) format - ImageType.PIC
• VDI (Ventura Publisher/GEM VDI Image Format Bitmap) format - ImageType.VDI
• ICO (Windows icon) format - ImageType.ICO
• JP2 (JPEG-2000) format - ImageType.JP2
• YCC (Kodak YCC image) format - ImageType.YCC
• FPX (FlashPix) format - ImageType.FPX
• DCX (Graphics Multipage PCX bitmap) format - ImageType.DCX
• ITC format - ImageType.ITC
• NIFF (Navy Image File Format) format - ImageType.NIFF
• WMP (Windows Media Photo) format - ImageType.WMP
• BPG format - ImageType.BPG
• FLIF format - ImageType.FLIF
• PDF (Portable Document Format) format - ImageType.PDF
• Unknown format - ImageType.Other

nim-imghdr is released under the MIT open source license.