Java 2D Image Manipulation A Brief Overview

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Java 2D Image ManipulationA Brief Overview
Ziv Yaniv
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BufferedImage

• ColorModel Translates from pixel data to
  (R,G,B,a), ComponentColorModel,
• 
  IndexColorModel, PackedColorModel .
• Raster The image data. Use the raster to access
  specific pixels or change their
• value (WritableRaster).
• SampleModel How to translate the data found in
  the DataBuffer as pixel
• values.
  ComponentSampleModel, MultiPixelPackedSampleModel
  ,
• 
  SinglePixelPackedSampleModel
• DataBuffer The actual image values which with
  the help of the SampleModel
• are translated to
  pixel data are then using the ColorModel to the
• pixels color.
  DataBufferByte, DataBufferInt, DataBufferShort,
• DataBufferUShort

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Loading an Image (java 2D)

• public BufferedImage loadImage(String fileName)
  
• Image img Toolkit.getDefaultToolkit().getIma
  ge(fileName)
• MediaTracker tracker new MediaTracker(new
  Component() )
• tracker.addImage(img, 0)
• try
• tracker.waitForID(0)
• catch(InterruptedException e) //error
  while loading
• BufferedImage res new BufferedImage(img.getW
  idth(null),
• 
  img.getHeight(null),
• BufferedImage.TYPE_I
  NT_RGB)
• Graphics2D g res.createGraphics()
• g.drawImage(img, null, null)
• return res

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Setting Pixel Values
//draw a red square in the middle of an
image final int halfEdgeSize 5 int redPixel
255, 0, 0 BufferedImage image
loadImage(theFileName) //pixel type is
INT_RGB WritableRaster raster
image.getRaster() int imgWidth
image.getWidth() int imgHeight
image.getHeight() for(int yimgHeight/2
halfEdgeSize ylt imgHeight/2 halfEdgeSize y)
for(int ximgWidth/2 halfEdgeSize ylt
imgWidth/2 halfEdgeSize x)
raster.setPixe(x, y, redPixel)
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BufferedImageOp

• Operations/Filters on BufferedImage objects are
  classes which implement the
• BufferedImageOp interface.
• Note These filters are single source single
  destination filters.
• For more advanced filters see Java
  Advanced Imaging JAI package.
• The available filters in the java 2D package
  are
• LookupOp, ConvolveOp, AffineTransformOp,
  ColorConvertOp, RescaleOp
• For examples of using these filters see the
  java tutorial.