How to save a BufferedImage as a File

Question

I am using the imgscalr Java library to resize an image    The result of a resize   method call is a BufferedImage object  I now want to save this as a file  usually  jpg    How can I do that  I want to go from BufferedImage -  File but perhaps this is not the correct approach

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You can save a BufferedImage object using write method of the javax imageio ImageIO class  The signature of the method is like this   public static boolean write RenderedImage im  String formatName  File output  throws IOException   Here im is the RenderedImage to be written  formatName is the String containing the informal name of the format  e g  png  and output is the file object to be written to  An example usage of the method for PNG file format is shown below   ImageIO write image   png   file

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As a one liner   ImageIO write Scalr resize ImageIO read       150

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File outputfile   new File  image jpg    ImageIO write bufferedImage   jpg   outputfile

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Create and save a java awt image bufferedImage to file   import java io    import java awt image    import javax imageio    public class Main      public static void main String args             try              BufferedImage img   new BufferedImage                   500  500  BufferedImage TYPE INT RGB                 File f   new File  MyFile png                int r   5              int g   25              int b   255              int col    r  lt  lt  16     g  lt  lt  8    b              for int x   0  x  lt  500  x                     for int y   20  y  lt  300  y                         img setRGB x  y  col                                               ImageIO write img   PNG   f                     catch Exception e               e printStackTrace                        Notes    Creates a file called MyFile png  Image is 500 by 500 pixels  Overwrites the existing file  The color of the image is black with a blue stripe across the top

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Download and add imgscalr-lib-x x jar and imgscalr-lib-x x-javadoc jar to your Projects Libraries  In your code   import static org imgscalr Scalr     public static BufferedImage resizeBufferedImage BufferedImage image  Scalr Method scalrMethod  Scalr Mode scalrMode  int width  int height         BufferedImage bi   image      bi   resize  image  scalrMethod  scalrMode  width  height   return bi        Save image  ImageIO write Scalr resize etotBImage  150    jpg   new File myDir

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The answer lies within the Java Documentation s Tutorial for Writing Saving an Image  The Image I O class provides the following method for saving an image  static boolean ImageIO write RenderedImage im  String formatName  File output   throws IOException  The tutorial explains that  The BufferedImage class implements the RenderedImage interface   so it s able to be used in the method  For example  try       BufferedImage bi   getMyImage        retrieve image     File outputfile   new File  quot saved png quot        ImageIO write bi   quot png quot   outputfile     catch  IOException e           handle exception    It s important to surround the write call with a try block because  as per the API  the method throws an IOException  quot if an error occurs during writing quot  Also explained are the method s objective  parameters  returns  and throws  in more detail   Writes an image using an arbitrary ImageWriter that supports the given format to a File  If there is already a File present  its contents are discarded  Parameters  im - a RenderedImage to be written  formatName - a String containg the informal name of the format  output - a File to be written to  Returns  false if no appropriate writer is found  Throws  IllegalArgumentException - if any parameter is null  IOException - if an error occurs during writing   However  formatName may still seem rather vague and ambiguous  the tutorial clears it up a bit   The ImageIO write method calls the code that implements PNG writing a    PNG writer plug-in     The term plug-in is used since Image I O is extensible and can support a wide range of formats  But the following standard image format plugins   JPEG  PNG  GIF  BMP and WBMP are always be present  For most applications it is sufficient to use one of these standard plugins  They have the advantage of being readily available   There are  however  additional formats you can use   The Image I O class provides a way to plug in support for additional formats which can be used  and many such plug-ins exist  If you are interested in what file formats are available to load or save in your system  you may use the getReaderFormatNames and getWriterFormatNames methods of the ImageIO class  These methods return an array of strings listing all of the formats supported in this JRE  String writerNames     ImageIO getWriterFormatNames    The returned array of names will include any additional plug-ins that are installed and any of these names may be used as a format name to select an image writer   For a full and practical example  one can refer to Oracle s SaveImage java example

[java] How to save a BufferedImage as a File

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