/* (non-Javadoc) * @see java.awt.image.BufferedImageOp#filter(java.awt.image.BufferedImage, java.awt.image.BufferedImage) */ public BufferedImage filter(BufferedImage src, BufferedImage dst) { if (src == null) { throw new NullPointerException("src image is null"); } if (src == dst) { throw new IllegalArgumentException("src image cannot be the " + "same as the dst image"); } boolean needToConvert = false; ColorModel srcCM = src.getColorModel(); ColorModel dstCM; BufferedImage origDst = dst; if (srcCM instanceof IndexColorModel) { IndexColorModel icm = (IndexColorModel) srcCM; src = icm.convertToIntDiscrete(src.getRaster(), false); srcCM = src.getColorModel(); } if (dst == null) { dst = createCompatibleDestImage(src, null); dstCM = srcCM; origDst = dst; } else { dstCM = dst.getColorModel(); if (srcCM.getColorSpace().getType() != dstCM.getColorSpace().getType()) { needToConvert = true; dst = createCompatibleDestImage(src, null); dstCM = dst.getColorModel(); } else if (dstCM instanceof IndexColorModel) { dst = createCompatibleDestImage(src, null); dstCM = dst.getColorModel(); } } java.awt.image.CropImageFilter cropfilter = new java.awt.image.CropImageFilter(region.x, region.y, region.width, region.height); Image returnImage = Toolkit.getDefaultToolkit() .createImage(new java.awt.image.FilteredImageSource(src.getSource(), cropfilter)); dst = ImageConverter.convertImage(returnImage); origDst = dst; if (needToConvert) { ColorConvertOp ccop = new ColorConvertOp(hints); ccop.filter(dst, origDst); } else if (origDst != dst) { java.awt.Graphics2D g2 = origDst.createGraphics(); try { g2.drawImage(dst, 0, 0, null); } finally { g2.dispose(); } } return origDst; }