Java无头双三次图像调整大小

Question

我需要在没有X服务器的情况下执行Java图像裁剪和调整大小。

我尝试了几种方法。下面的第一种方法可以工作，但是会输出相当难看的调整大小图像（可能使用最近邻居算法进行调整大小：

static BufferedImage createResizedCopy(Image originalImage, int scaledWidth, int scaledHeight, boolean preserveAlpha)
{
    int imageType = preserveAlpha ? BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB;
    BufferedImage scaledBI = new BufferedImage(scaledWidth, scaledHeight, imageType);
    Graphics2D g = scaledBI.createGraphics();
    if (preserveAlpha)
    {
        g.setComposite(AlphaComposite.Src);
    }
    g.drawImage(originalImage, 0, 0, scaledWidth, scaledHeight, null);
    g.dispose();
    return scaledBI;
}

因此，我决定使用双三次调整大小，这会产生更好的结果：

public static BufferedImage createResizedCopy(BufferedImage source, int destWidth, int destHeight, Object interpolation)
{
    if (source == null) throw new NullPointerException("source image is NULL!");
    if (destWidth <= 0 && destHeight <= 0) throw new IllegalArgumentException("destination width & height are both <=0!");
    int sourceWidth = source.getWidth();
    int sourceHeight = source.getHeight();
    double xScale = ((double) destWidth) / (double) sourceWidth;
    double yScale = ((double) destHeight) / (double) sourceHeight;
    if (destWidth <= 0)
    {
        xScale = yScale;
        destWidth = (int) Math.rint(xScale * sourceWidth);
    }
    if (destHeight <= 0)
    {
        yScale = xScale;
        destHeight = (int) Math.rint(yScale * sourceHeight);
    }
    GraphicsConfiguration gc = getDefaultConfiguration();
    BufferedImage result = gc.createCompatibleImage(destWidth, destHeight, source.getColorModel().getTransparency());
    Graphics2D g2d = null;
    try
    {
        g2d = result.createGraphics();
        g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, interpolation);
        AffineTransform at = AffineTransform.getScaleInstance(xScale, yScale);
        g2d.drawRenderedImage(source, at);
    }
    finally
    {
        if (g2d != null) g2d.dispose();
    }
    return result;
}

public static GraphicsConfiguration getDefaultConfiguration()
{
    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice gd = ge.getDefaultScreenDevice();
    return gd.getDefaultConfiguration();
}

直到我尝试将其放到服务器上之前，它都工作良好，这时我碰到了java.awt.HeadlessException。我尝试使用java.awt.headless
= true失败。

因此，这是一个问题：如何在没有X服务器的情况下使用双三次插值算法在Java中调整大小并裁剪图像？

答： 使用Bozho注释中的代码，我创建了该功能，该功能可以解决问题（插值应为RenderingHints.VALUE_INTERPOLATION_
*）。

public static BufferedImage createResizedCopy(BufferedImage source, int destWidth, int destHeight, Object interpolation)
{
    BufferedImage bicubic = new BufferedImage(destWidth, destHeight, source.getType());
    Graphics2D bg = bicubic.createGraphics();
    bg.setRenderingHint(RenderingHints.KEY_INTERPOLATION, interpolation);
    float sx = (float)destWidth / source.getWidth();
    float sy = (float)destHeight / source.getHeight();
    bg.scale(sx, sy);
    bg.drawImage(source, 0, 0, null);
    bg.dispose();
    return bicubic;
}

Answer 1

检查此代码。还要检查Image.getScaledInstance(..)（“平滑”缩放）是否不能解决问题。最后，看看java-
image-scaling-library
。