Resizing image in Java

Question

I have a PNG image and I want to resize it  How can I do that  Though I have gone through this I can t understand the snippet

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int newHeight   150              int newWidth   150               holder iv arrow requestLayout                holder iv arrow getLayoutParams   height   newHeight              holder iv arrow getLayoutParams   width   newWidth              holder iv arrow setScaleType ImageView ScaleType FIT XY               holder iv arrow setImageResource R drawable video menu

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We re doing this to create thumbnails of images     BufferedImage tThumbImage   new BufferedImage  tThumbWidth  tThumbHeight  BufferedImage TYPE INT RGB      Graphics2D tGraphics2D   tThumbImage createGraphics      create a graphics object to paint to   tGraphics2D setBackground  Color WHITE      tGraphics2D setPaint  Color WHITE      tGraphics2D fillRect  0  0  tThumbWidth  tThumbHeight      tGraphics2D setRenderingHint  RenderingHints KEY INTERPOLATION  RenderingHints VALUE INTERPOLATION BILINEAR      tGraphics2D drawImage  tOriginalImage  0  0  tThumbWidth  tThumbHeight  null      draw the image scaled    ImageIO write  tThumbImage   JPG   tThumbnailTarget      write the image to a file

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Simple way in Java public void resize String inputImagePath              String outputImagePath  int scaledWidth  int scaledHeight              throws IOException              reads input image         File inputFile   new File inputImagePath           BufferedImage inputImage   ImageIO read inputFile                creates output image         BufferedImage outputImage   new BufferedImage scaledWidth                  scaledHeight  inputImage getType                  scales the input image to the output image         Graphics2D g2d   outputImage createGraphics            g2d drawImage inputImage  0  0  scaledWidth  scaledHeight  null           g2d dispose                 extracts extension of output file         String formatName   outputImagePath substring outputImagePath                  lastIndexOf  quot   quot     1                writes to output file         ImageIO write outputImage  formatName  new File outputImagePath

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If you have an java awt Image  rezising it doesn t require any additional libraries  Just do   Image newImage   yourImage getScaledInstance newWidth  newHeight  Image SCALE DEFAULT     Ovbiously  replace newWidth and newHeight with the dimensions of the specified image  Notice the last parameter  it tells to the runtime the algorithm you want to use for resizing   There are algorithms that produce a very precise result  however these take a large time to complete  You can use any of the following algorithms    Image SCALE DEFAULT  Use the default image-scaling algorithm  Image SCALE FAST  Choose an image-scaling algorithm that gives higher priority to scaling speed than smoothness of the scaled image  Image SCALE SMOOTH  Choose an image-scaling algorithm that gives higher priority to image smoothness than scaling speed  Image SCALE AREA AVERAGING  Use the Area Averaging image scaling algorithm  Image SCALE REPLICATE  Use the image scaling algorithm embodied in the ReplicateScaleFilter class    See the Javadoc for more info

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Resize image with high quality   private static InputStream resizeImage InputStream uploadedInputStream  String fileName  int width  int height             try               BufferedImage image   ImageIO read uploadedInputStream               Image originalImage  image getScaledInstance width  height  Image SCALE DEFAULT                int type     image getType      0    BufferedImage TYPE INT ARGB   image getType                 BufferedImage resizedImage   new BufferedImage width  height  type                Graphics2D g2d   resizedImage createGraphics                g2d drawImage originalImage  0  0  width  height  null               g2d dispose                g2d setComposite AlphaComposite Src               g2d setRenderingHint RenderingHints KEY INTERPOLATION RenderingHints VALUE INTERPOLATION BILINEAR               g2d setRenderingHint RenderingHints KEY RENDERING RenderingHints VALUE RENDER QUALITY               g2d setRenderingHint RenderingHints KEY ANTIALIASING RenderingHints VALUE ANTIALIAS ON                ByteArrayOutputStream byteArrayOutputStream   new ByteArrayOutputStream                 ImageIO write resizedImage  fileName split        1   byteArrayOutputStream               return new ByteArrayInputStream byteArrayOutputStream toByteArray               catch  IOException e                   Something is going wrong while resizing image             return uploadedInputStream

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Try this   ImageIcon icon   new ImageIcon UrlToPngFile   Image scaleImage   icon getImage   getScaledInstance 28  28 Image SCALE DEFAULT

[java] Resizing image in Java

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