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POScale an image which is stored as a byte[] in Java
 

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  1. POScale an image which is stored as a byte[] in Java
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    <p>I upload a file with a struts form. I have the image as a byte[] and I would like to scale it.</p> <pre><code>FormFile file = (FormFile) dynaform.get("file"); byte[] fileData = file.getFileData(); fileData = scale(fileData,200,200); public byte[] scale(byte[] fileData, int width, int height) { // TODO } </code></pre> <p>Anyone knows an easy function to do this?</p> <pre><code>public byte[] scale(byte[] fileData, int width, int height) { ByteArrayInputStream in = new ByteArrayInputStream(fileData); try { BufferedImage img = ImageIO.read(in); if(height == 0) { height = (width * img.getHeight())/ img.getWidth(); } if(width == 0) { width = (height * img.getWidth())/ img.getHeight(); } Image scaledImage = img.getScaledInstance(width, height, Image.SCALE_SMOOTH); BufferedImage imageBuff = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); imageBuff.getGraphics().drawImage(scaledImage, 0, 0, new Color(0,0,0), null); ByteArrayOutputStream buffer = new ByteArrayOutputStream(); ImageIO.write(imageBuff, "jpg", buffer); return buffer.toByteArray(); } catch (IOException e) { throw new ApplicationException("IOException in scale"); } } </code></pre> <p>If you run out of Java Heap Space in tomcat as I did, increase the heap space which is used by tomcat. In case you use the tomcat plugin for Eclipse, next should apply: </p> <blockquote> <p>In Eclipse, choose Window > Preferences > Tomcat > JVM Settings</p> <p>Add the following to the JVM Parameters section</p> <p>-Xms256m -Xmx512m</p> </blockquote>
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    1. USJuha Syrjälä
    1. USSergio del Amo
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      1. USMartynas Jurkus
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    1. CO__Guessing here__ : JPEG doesn't do transparency. Change the `TYPE_INT_ARGB` to `TYPE_INT_RGB` and `new Color(0,0,0,0)` to `new Color(0,0,0)`
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      1. POScale an image which is stored as a byte[] in Java
      1. USKevin Montrose
    2. COAs for heap space, you could save some of space by working directly on an input stream instead of reading it into a byte array. However, to scale an image you need a copy of it (and its scaled version) in memory; so you might just have to increase heap space. Look into `java -xmx`.
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      1. POScale an image which is stored as a byte[] in Java
      1. USKevin Montrose
 

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