调整RenderedImage的大小

Question

我正在使用RenderedImage在我的应用中的DisplayJAI中显示tiff。

有人知道如何调整RenderedImage实例的大小？

Answer 1

我用JAI做了很长时间，但"Scale"或"Affine"操作不够吗？

修改：以下是指向Programmer's Guide和"Scale"的"Affine"的几个链接。

Answer 2

public static RenderedImage scale(RenderedImage image, float scaleFactor)
    RenderingHints hints = new RenderingHints(RenderingHints.KEY_RENDERING,
      RenderingHints.VALUE_RENDER_QUALITY);

    RenderedOp resizeOp = SubsampleAverageDescriptor.create(image,
      Double.valueOf(scaleFactor), Double.valueOf(scaleFactor), hints);

    BufferedImage bufferedResizedImage = resizeOp.getAsBufferedImage();

    return bufferedResizedImage;
}

Answer 3

这里有一个示例代码： http://answers.yahoo.com/question/index?qid=20090827075608AA12kEZ

相关代码：

BufferedImage img = ImageIO.read(new File("~/your/file/system/example.jpeg"));
BufferedImage thumb = new BufferedImage(w2, h2, BufferedImage.TYPE_INT_RGB);
thumb.createGraphics().drawImage(
img.getScaledInstance(w2, h2, java.awt.Image.SCALE_SMOOTH), 0, 0, null);
File file = new File(fullpath + filename);
ImageIO.write(thumb, "png", file);