如何将java swing面板转换为质量图像

问题描述

我的面板看起来像：

当我转换成图像

public BufferedImage createImage(JPanel panel) {

int w = (int) PageSize.A4.getWidth();//panel.getWidth();
int h = (int) PageSize.A4.getHeight();//panel.getHeight();

BufferedImage originalImage = new BufferedImage(panel.getHeight(), panel.getWidth(), BufferedImage.TYPE_BYTE_INDEXED);
Graphics2D gg = originalImage.createGraphics();
gg.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
        RenderingHints.VALUE_INTERPOLATION_BILINEAR);
gg.setRenderingHint(RenderingHints.KEY_RENDERING,
        RenderingHints.VALUE_RENDER_QUALITY);
gg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);
panel.paint(gg);

BufferedImage resizedImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g = resizedImage.createGraphics();
g.drawImage(originalImage, 0, 0, w, h, null);
g.dispose();
g.setComposite(AlphaComposite.Src);

g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
        RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g.setRenderingHint(RenderingHints.KEY_RENDERING,
        RenderingHints.VALUE_RENDER_QUALITY);
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);

return resizedImage;
}

它看起来很糟糕 - 质量越来越高质量

it looks terrible - larger and worse quality

如何将图像的质量改为面板的质量？

how I can change quaity of this image to the quality of panel ?

编辑：

库您需要编译此代码：

import com.itextpdf.text.PageSize;
import java.awt.AlphaComposite;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import javax.swing.JPanel;

推荐答案

从字面上回答你的问题：

To literally answer your question:

我如何才能将此图片的质量改为面板质量？

简单，不要改变你的图像的大小。放下整个将您的图像拉伸到A4尺寸，因为这是质量损失的原因。

Simple, do not alter the size of your image. Drop the whole 'stretching your image to A4 size' as this is the cause of the quality loss.

public BufferedImage createImage(JPanel panel) {
  BufferedImage originalImage = new BufferedImage(
        panel.getHeight(), panel.getWidth(), 
        BufferedImage.TYPE_BYTE_INDEXED);
  Graphics2D gg = originalImage.createGraphics();
  gg.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
        RenderingHints.VALUE_INTERPOLATION_BILINEAR);
  gg.setRenderingHint(RenderingHints.KEY_RENDERING,
        RenderingHints.VALUE_RENDER_QUALITY);
  gg.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
        RenderingHints.VALUE_ANTIALIAS_ON);
  panel.paint(gg);
  gg.dispose();
  return originalImage;
}

不知道这是否是你一直在寻找的。如果您确实希望将图像设为A4尺寸，建议您尝试在将面板转换成图像之前将其面板锐化为A4尺寸。将小图像拉伸到较大版本将始终导致质量损失。

Not sure however if this is what you have been looking for. If you really want the image to be on A4 size, I suggest trying to get your panel sharply rendered on A4 size before converting it to an image. Stretching a small image to a larger version will always result in quality loss.

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