How to get image height and width using java

Question

Is there any other way besides using ImageIO read to get image height and width   Because I encounter an issue that locks up the thread   at com sun medialib codec jpeg Decoder njpeg decode Native Method        at com sun medialib codec jpeg Decoder decode Decoder java 87        at com sun media imageioimpl plugins jpeg CLibJPEGImageReader decode CLibJPEGImageReader java 73        - locked  lt 0xd96fb668 gt   a com sun media imageioimpl plugins jpeg CLibJPEGImageReader        at com sun media imageioimpl plugins clib CLibImageReader getImage CLibImageReader java 320       - locked  lt 0xd96fb668 gt   a com sun media imageioimpl plugins jpeg CLibJPEGImageReader        at com sun media imageioimpl plugins clib CLibImageReader read CLibImageReader java 384      - locked  lt 0xd96fb668 gt   a com sun media imageioimpl plugins jpeg CLibJPEGImageReader        at javax imageio ImageIO read ImageIO java 1400        at javax imageio ImageIO read ImageIO java 1322    This error only occurs on a Sun app server and therefore I suspect that it is a Sun bug

User · Answer

To get size of emf file without EMF Image Reader you can use code   Dimension getImageDimForEmf final String path  throws IOException        ImageInputStream inputStream   new FileImageInputStream new File path         inputStream setByteOrder ByteOrder LITTLE ENDIAN           Skip magic number and file size     inputStream skipBytes 6 4        int left     inputStream readInt        int top      inputStream readInt        int right    inputStream readInt        int bottom   inputStream readInt            Skip other headers     inputStream skipBytes 30        int deviceSizeInPixelX   inputStream readInt        int deviceSizeInPixelY   inputStream readInt         int deviceSizeInMlmX   inputStream readInt        int deviceSizeInMlmY   inputStream readInt         int widthInPixel    int  Math round 0 5     right - left   1 0    deviceSizeInPixelX   deviceSizeInMlmX    100 0       int heightInPixel    int  Math round 0 5     bottom-top   1 0    deviceSizeInPixelY   deviceSizeInMlmY    100 0        inputStream close         return new Dimension widthInPixel  heightInPixel

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Here is something very simple and handy     BufferedImage bimg   ImageIO read new File filename    int width            bimg getWidth    int height           bimg getHeight

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I tried to test performance using some of the various approaches listed  It s hard to make a rigorous test as many factors affect the result  I prepared two folders  one with 330 jpg files and another one with 330 png files  The average file size was 4Mb in both cases  Then I called getDimension for each file  Each implementation of getDimension method and each image type was tested separately  separate run   Here is the execution times that I got  first number for jpg  second number for png     1 Apurv  - 101454ms  84611ms 2 joinJpegs  - 471ms  N A 3 Andrew Taylor  - 707ms  68ms 4 Karussell  ImageIcon  - 106655ms  100898ms 5 user350756  - 2649ms  68ms   It s obvious that some methods load the whole file in order to get dimensions while others get by just reading some header information from the image  I think these numbers may be useful when application performance is critical   Thank you everyone for the contribution to this thread - very helpful

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Having struggled with ImageIO a lot in the past years  I think Andrew Taylor s solution is by far the best compromise  fast  not using ImageIO read  and versatile   Thanks man    But I was a little frustrated to be compelled to use a local file  File String   especially in cases where you want to check image sizes coming from  say  a multipart form-data request where you usually retrieve InputPart InputStream s  So I quickly made a variant that accepts File  InputStream and RandomAccessFile  based on the ability of ImageIO createImageInputStream to do so   Of course  such a method with Object input  may only remain private and you shall create as many polymorphic methods as needed  calling this one  You can also accept Path with Path toFile   and URL with URL openStream   prior to passing to this method     private static Dimension getImageDimensions Object input  throws IOException        try  ImageInputStream stream   ImageIO createImageInputStream input        accepts File  InputStream  RandomAccessFile       if stream    null            IIORegistry iioRegistry   IIORegistry getDefaultInstance            Iterator lt ImageReaderSpi gt  iter   iioRegistry getServiceProviders ImageReaderSpi class  true           while  iter hasNext                ImageReaderSpi readerSpi   iter next              if  readerSpi canDecodeInput stream                 ImageReader reader   readerSpi createReaderInstance                try                 reader setInput stream                 int width   reader getWidth reader getMinIndex                   int height   reader getHeight reader getMinIndex                   return new Dimension width  height                 finally                 reader dispose                                                throw new IllegalArgumentException  Can t find decoder for this image            else           throw new IllegalArgumentException  Can t open stream for this image

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You can get width and height of image with BufferedImage object using java   public void setWidthAndHeightImage FileUploadEvent event       byte   imageTest   event getFile   getContents                    baiStream   new ByteArrayInputStream imageTest                    BufferedImage bi   ImageIO read baiStream                     get width and height of image                 int imageWidth   bi getWidth                    int imageHeight   bi getHeight

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To get a Buffered Image with ImageIO read is a very heavy method  as it s creating a complete uncompressed copy of the image in memory  For png s you may also use pngj and the code   if  png      PngReader pngr   new PngReader file       width   pngr imgInfo cols      height   pngr imgInfo rows      pngr close

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This is a rewrite of the great post by  Kay  which throws IOException and provides an early exit          Gets image dimensions for given file      param imgFile image file     return dimensions of image     throws IOException if the file is not a known image     public static Dimension getImageDimension File imgFile  throws IOException     int pos   imgFile getName   lastIndexOf         if  pos    -1      throw new IOException  No extension for file      imgFile getAbsolutePath       String suffix   imgFile getName   substring pos   1     Iterator lt ImageReader gt  iter   ImageIO getImageReadersBySuffix suffix     while iter hasNext          ImageReader reader   iter next        try         ImageInputStream stream   new FileImageInputStream imgFile         reader setInput stream         int width   reader getWidth reader getMinIndex           int height   reader getHeight reader getMinIndex           return new Dimension width  height         catch  IOException e          log warn  Error reading      imgFile getAbsolutePath    e         finally         reader dispose                 throw new IOException  Not a known image file      imgFile getAbsolutePath         I guess my rep is not high enough for my input to be considered worthy as a reply

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Simple way   BufferedImage readImage   null   try       readImage   ImageIO read new File your path       int h   readImage getHeight        int w   readImage getWidth      catch  Exception e        readImage   null

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Problem with ImageIO read is that it is really slow  All you need to do is to read image header to get the size  ImageIO getImageReader is perfect candidate   Here is the Groovy example  but the same thing applies to Java  def stream   ImageIO createImageInputStream newByteArrayInputStream inputStream   def formatReader   ImageIO getImageWritersByFormatName format  next    def reader   ImageIO getImageReader formatReader  reader setInput stream  true   println  width reader getWidth 0  - gt  height  reader getHeight 0     The performance was the same as using SimpleImageInfo java library   https   github com cbeust personal blob master src main java com beust SimpleImageInfo java

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I have found another way to read an image size  more generic    You can use ImageIO class in cooperation with ImageReaders   Here is the sample code   private Dimension getImageDim final String path        Dimension result   null      String suffix   this getFileSuffix path       Iterator lt ImageReader gt  iter   ImageIO getImageReadersBySuffix suffix       if  iter hasNext              ImageReader reader   iter next            try               ImageInputStream stream   new FileImageInputStream new File path                reader setInput stream               int width   reader getWidth reader getMinIndex                 int height   reader getHeight reader getMinIndex                 result   new Dimension width  height             catch  IOException e                log e getMessage               finally               reader dispose                    else           log  No reader found for given format      suffix              return result      Note that getFileSuffix is method that returns extension of path without     so e g   png  jpg etc  Example implementation is   private String getFileSuffix final String path        String result   null      if  path    null            result               if  path lastIndexOf         -1                result   path substring path lastIndexOf                    if  result startsWith                         result   result substring 1                                     return result      This solution is very quick as only image size is read from the file and not the whole image  I tested it and there is no comparison to ImageIO read performance  I hope someone will find this useful

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So unfortunately  after trying all the answers from above  I did not get them to work after tireless times of trying  So I decided to do the real hack myself and I go this to work for me  I trust it would work perfectly for you too    I am using this simple method to get the width of an image generated by the app and yet to be upload later for verification    Pls  take note   you would have to enable permissions in manifest for access storage    I made it static and put in my Global class so I can reference or access it from just one source and if there is any modification  it would all have to be done at just one place  Just maintaining a DRY concept in java   anyway       public static int getImageWidthOrHeight String imgFilePath                 Log d  img path     imgFilePath                   Decode image size             BitmapFactory Options o   new BitmapFactory Options                o inJustDecodeBounds   true              BitmapFactory decodeFile imgFilePath  o                int width tmp   o outWidth  height tmp   o outHeight               Log d  Image width      Integer toString width tmp                    you can decide to rather return height tmp to get the height               return width tmp

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You can load jpeg binary data as a file and parse the jpeg headers yourself  The one you are looking for is the 0xFFC0 or Start of Frame header   Start of frame marker  FFC0     the first two bytes  the length  after the marker indicate the number of bytes  including the two length bytes  that this header contains   P -- one byte  sample precision in bits  usually 8  for baseline JPEG    Y -- two bytes   X -- two bytes   Nf -- one byte  the number of components in the image       o 3 for color baseline JPEG images       o 1 for grayscale baseline JPEG images    Nf times        o Component ID -- one byte       o H and V sampling factors -- one byte  H is first four bits and V is second four bits       o Quantization table number-- one byte  The H and V sampling factors dictate the final size of the component they are associated with  For instance  the color space defaults to YCbCr and the H and V sampling factors for each component  Y  Cb  and Cr  default to 2  1  and 1  respectively  2 for both H and V of the Y component  etc   in the Jpeg-6a library by the Independent Jpeg Group  While this does mean that the Y component will be twice the size of the other two components--giving it a higher resolution  the lower resolution components are quartered in size during compression in order to achieve this difference  Thus  the Cb and Cr components must be quadrupled in size during decompression    For more info about the headers check out wikipedia s jpeg entry or I got the above info here   I used a method similar to the code below which I got from this post at the sun forums   import java awt Dimension  import java io     public class JPEGDim    public static Dimension getJPEGDimension File f  throws IOException       FileInputStream fis   new FileInputStream f           check for SOI marker     if  fis read      255    fis read      216          throw new RuntimeException  SOI  Start Of Image  marker 0xff 0xd8 missing         Dimension d   null       while  fis read      255            int marker   fis read            int len   fis read    lt  lt  8   fis read             if  marker    192                fis skip 1                int height   fis read    lt  lt  8   fis read                int width   fis read    lt  lt  8   fis read                 d   new Dimension width  height               break                     fis skip len - 2              fis close         return d     public static void main String   args  throws IOException       System out println getJPEGDimension new File args 0

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You could use the Toolkit  no need for ImageIO  Image image   Toolkit getDefaultToolkit   getImage file getAbsolutePath     int width   image getWidth null   int height   image getHeight null     If you don t want to handle the loading of the image do  ImageIcon imageIcon   new ImageIcon file getAbsolutePath     int height   imageIcon getIconHeight    int width   imageIcon getIconWidth

[java] How to get image height and width using java?

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