高品质缩略图在java

Question

我试过下面的代码来生成缩略图。

我能够得到缩略图，但质量不存在。请任何人帮助我在这一个生成高品质的缩略图？原始图像是高品质的。

BufferedImage thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB); 
Graphics2D graphics2D = thumbImage.createGraphics(); 
graphics2D.setBackground(Color.WHITE); 
graphics2D.setPaint(Color.WHITE); 
graphics2D.fillRect(0, 0, thumbWidth, thumbHeight); 
graphics2D.setComposite(AlphaComposite.Src); 

graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,RenderingHints.VALUE_INTERPOLATION_BILINEAR); 
graphics2D.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY); 
graphics2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON); 
graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null); 
graphics2D.dispose();  
File file = new File(thumbnailFile); 
if (javax.imageio.ImageIO.write(thumbImage, "JPG", file)) 
    return file; 

Answer 1

你可能想看看这个：http://download.oracle.com/javase/tutorial/uiswing/components/icon.html

http://download.oracle.com/javase/tutorial/uiswing/examples/components/IconDemoProject/src/components/IconDemoApp.java

我用作为前做类似的参考。

Answer 2

我有同样的问题，发现在最后用示例代码和样本图像这篇大文章：

http://today.java.net/pub/a/today/2007/04/03/perils-of-image-getscaledinstance.html

Answer 3

检查这个I found best jar file here

public static javaxt.io.Image resizeThumbnailImage(javaxt.io.Image image, int width, int height) { 

    Integer imgWidth = image.getWidth(); 
    Integer imgHeight = image.getHeight(); 
    Double imgRatio = (imgWidth.doubleValue()/imgHeight.doubleValue()); 
    logger.info("\n======= imgRatio " + imgRatio); 
    if (imgRatio >= 2) { 
     image.setWidth(width - 1); 

    } else if (imgRatio < 1) { 
     image.setHeight(300); 

    } else { 
     Double expectedHeight = (imgRatio * (height/ProjectConstant.THUMBNAIL_IMG_ASPECT_RATIO)); 
     image.setHeight(expectedHeight.intValue()); 

     if (image.getWidth() > width) { 
      image.setWidth(width - 20); 
     } 
    } 
    logger.info("=======after Processing image Width " + image.getWidth()+" Hight "+image.getHeight()); 

    return image; 
} 

我不断

public static final double THUMBNAIL_IMG_ASPECT_RATIO = 1.4;