调整大小后的图像质量非常低--Java

在脚本中，它从大约300x300标记下降到60x60。需要提高整体图像质量，因为目前图像质量非常差

public static Boolean resizeImage(String sourceImg, String destImg, Integer Width, Integer Height, Integer whiteSpaceAmount) 
{
    BufferedImage origImage;

    try 
    {
        origImage = ImageIO.read(new File(sourceImg));
        int type = origImage.getType() == 0? BufferedImage.TYPE_INT_ARGB : origImage.getType();
        int fHeight = Height;
        int fWidth = Width;
        int whiteSpace = Height + whiteSpaceAmount; //Formatting all to squares so don't need two whiteSpace calcs..
        double aspectRatio;

        //Work out the resized dimensions
        if (origImage.getHeight() > origImage.getWidth()) //If the pictures height is greater than the width then scale appropriately.
        {
            fHeight = Height; //Set the height to 60 as it is the biggest side.

            aspectRatio = (double)origImage.getWidth() / (double)origImage.getHeight(); //Get the aspect ratio of the picture.
            fWidth = (int)Math.round(Width * aspectRatio); //Sets the width as created via the aspect ratio.
        }
        else if (origImage.getHeight() < origImage.getWidth()) //If the pictures width is greater than the height scale appropriately.
        {
            fWidth = Width; //Set the height to 60 as it is the biggest side.

            aspectRatio = (double)origImage.getHeight() / (double)origImage.getWidth(); //Get the aspect ratio of the picture.
            fHeight = (int)Math.round(Height * aspectRatio); //Sets the height as created via the aspect ratio.
        }

        int extraHeight = whiteSpace - fHeight;
        int extraWidth = whiteSpace - fWidth;

        BufferedImage resizedImage = new BufferedImage(whiteSpace, whiteSpace, type);
        Graphics2D g = resizedImage.createGraphics();
        g.setColor(Color.white);
        g.fillRect(0, 0, whiteSpace, whiteSpace);

        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);

        g.drawImage(origImage, extraWidth/2, extraHeight/2, fWidth, fHeight, null);
        g.dispose();

        ImageIO.write(resizedImage, "jpg", new File(destImg));
    } 
    catch (IOException ex) 
    {
        return false;
    }

    return true;
}

public static Boolean resizeImage（字符串sourceImg、字符串destImg、整数宽度、整数高度、整数空白量）
{
缓冲图像源；
尝试
{
origImage=ImageIO.read（新文件（sourceImg））；
int type=origImage.getType（）=0？BufferedImage.type_int_ARGB:origImage.getType（）；
int fHeight=高度；
int fWidth=宽度；
int whiteSpace=Height+whiteSpaceAmount；//将所有内容格式化为正方形，因此不需要两个空格计算。。
双方面；
//计算出调整尺寸后的尺寸
if（origImage.getHeight（）>origImage.getWidth（））//如果图片高度大于宽度，则适当缩放。
{
fHeight=Height；//将高度设置为60，因为它是最大的边。
aspectRatio=（双）origImage.getWidth（）/（双）origImage.getHeight（）；//获取图片的纵横比。
fWidth=（int）Math.round（Width*aspectRatio）；//设置通过纵横比创建的宽度。
}
else if（origImage.getHeight（）

真的只需要知道他们的产品是我可以插入的，可以提高质量，还是我需要完全看其他的产品

编辑：图片比较

来源，刚从谷歌随机挑选了一台洗衣机。

同样的图片在Photoshop中转换成我需要的样子。

它看起来像是这样被转换的。

---

在较大范围内缩小图像本身就很危险（从质量的角度来看），尤其是使用单个步骤

推荐的方法是使用分而治之的方法。基本上，您可以按50%的步长缩小图像，直到达到所需的大小

因此，我拍摄了650x748的原始图像，并将其缩小到60x60区域（52x60）内

分而治之比一步

public class TestImageResize {

    public static void main(String[] args) {
        new TestImageResize();
    }

    public TestImageResize() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new ScalePane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class ScalePane extends JPanel {

        private BufferedImage original;
        private BufferedImage scaled;

        public ScalePane() {
            try {
                original = ImageIO.read(new File("path/to/master.jpg"));
                scaled = getScaledInstanceToFit(original, new Dimension(60, 60));
                ImageIO.write(scaled, "jpg", new File("scaled.jpg"));

                BufferedImage image = new BufferedImage(52, 60, BufferedImage.TYPE_INT_RGB);
                Graphics2D g2d = image.createGraphics();
                g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
                g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
                g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
                g2d.drawImage(original, 0, 0, 52, 60, this);
                g2d.dispose();

                ImageIO.write(image, "jpg", new File("test.jpg"));

            } catch (IOException ex) {
                ex.printStackTrace();
            }
        }

        @Override
        public Dimension getPreferredSize() {

            Dimension size = super.getPreferredSize();
            if (original != null) {
                if (scaled != null) {
                    size.width = original.getWidth() + scaled.getWidth();
                    size.height = original.getHeight();
                } else {
                    size.width = original.getWidth();
                    size.height = original.getHeight();
                }
            }

            return size;
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2d = (Graphics2D) g.create();
            g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
            g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

            if (original != null) {
                int x = 0;
                int y = (getHeight() - original.getHeight()) / 2;;
                if (scaled != null) {
                    x = (getWidth() - (original.getWidth() + scaled.getWidth())) / 2;
                } else {
                    x = (getWidth() - original.getWidth()) / 2;
                }
                g2d.drawImage(original, x, y, this);

                if (scaled != null) {
                    x += original.getWidth();
                    y = (getHeight() - scaled.getHeight()) / 2;
                    g2d.drawImage(scaled, x, y, this);
                }
            }
            g2d.dispose();
        }

        public BufferedImage getScaledInstanceToFit(BufferedImage img, Dimension size) {
            float scaleFactor = getScaleFactorToFit(img, size);
            return getScaledInstance(img, scaleFactor);
        }

        public float getScaleFactorToFit(BufferedImage img, Dimension size) {
            float scale = 1f;
            if (img != null) {
                int imageWidth = img.getWidth();
                int imageHeight = img.getHeight();
                scale = getScaleFactorToFit(new Dimension(imageWidth, imageHeight), size);
            }
            return scale;
        }

        public float getScaleFactorToFit(Dimension original, Dimension toFit) {
            float scale = 1f;
            if (original != null && toFit != null) {
                float dScaleWidth = getScaleFactor(original.width, toFit.width);
                float dScaleHeight = getScaleFactor(original.height, toFit.height);
                scale = Math.min(dScaleHeight, dScaleWidth);
            }
            return scale;
        }

        public float getScaleFactor(int iMasterSize, int iTargetSize) {
            float scale = 1;
            if (iMasterSize > iTargetSize) {
                scale = (float) iTargetSize / (float) iMasterSize;
            } else {
                scale = (float) iTargetSize / (float) iMasterSize;
            }
            return scale;
        }

        public BufferedImage getScaledInstance(BufferedImage img, double dScaleFactor) {
            BufferedImage imgBuffer = null;
            imgBuffer = getScaledInstance(img, dScaleFactor, RenderingHints.VALUE_INTERPOLATION_BILINEAR, true);
            return imgBuffer;
        }

        protected BufferedImage getScaledInstance(BufferedImage img, double dScaleFactor, Object hint, boolean higherQuality) {

            int targetWidth = (int) Math.round(img.getWidth() * dScaleFactor);
            int targetHeight = (int) Math.round(img.getHeight() * dScaleFactor);

            int type = (img.getTransparency() == Transparency.OPAQUE)
                            ? BufferedImage.TYPE_INT_RGB : BufferedImage.TYPE_INT_ARGB;

            BufferedImage ret = (BufferedImage) img;

            if (targetHeight > 0 || targetWidth > 0) {
                int w, h;
                if (higherQuality) {
                    w = img.getWidth();
                    h = img.getHeight();
                } else {
                    w = targetWidth;
                    h = targetHeight;
                }

                do {
                    if (higherQuality && w > targetWidth) {
                        w /= 2;
                        if (w < targetWidth) {
                            w = targetWidth;
                        }
                    }

                    if (higherQuality && h > targetHeight) {
                        h /= 2;
                        if (h < targetHeight) {
                            h = targetHeight;
                        }
                    }

                    BufferedImage tmp = new BufferedImage(Math.max(w, 1), Math.max(h, 1), type);
                    Graphics2D g2 = tmp.createGraphics();
                    g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, hint);
                    g2.drawImage(ret, 0, 0, w, h, null);
                    g2.dispose();

                    ret = tmp;
                } while (w != targetWidth || h != targetHeight);
            } else {
                ret = new BufferedImage(1, 1, type);
            }
            return ret;
        }
    }
}

公共类TestImageResize{
公共静态void main（字符串[]args）{
新TestImageResize（）；
}
公共TestImageResize（）{
invokeLater（新的Runnable（）{
@凌驾
公开募捐{
试一试{
UIManager.setLookAndFeel（UIManager.getSystemLookAndFeelClassName（））；
}捕获（例外情况除外）{
}
JFrame=新JFrame（“测试”）；
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）；
frame.setLayout（新的BorderLayout（））；
frame.add（新的ScalePane（））；
frame.pack（）；
frame.setLocationRelativeTo（空）；
frame.setVisible（true）；
}
});
}
公共类ScalePane扩展了JPanel{
私有缓冲区原始图像；
私有缓冲区图像缩放；
公共ScalePane（）{
试一试{
original=ImageIO.read（新文件（“path/to/master.jpg”）；
缩放=getScaledInstanceToFit（原始尺寸，新尺寸（60,60））；
write（按比例缩放，“jpg”，新文件（“scaled.jpg”）；
BuffereImage=新的BuffereImage（52,60，BuffereImage.TYPE_INT_RGB）；
Graphics2D g2d=image.createGraphics（）；
g2d.setRenderingHint（RenderingHits.KEY\u插值，RenderingHits.VALUE\u插值\u双线性）；
g2d.setRenderingHint（renderingHits.KEY_RENDERING，renderingHits.VALUE_RENDER_QUALITY）；
g2d.setRenderingHint（renderingHits.KEY\u抗锯齿，renderingHits.VALUE\u抗锯齿\u开启）；
g2d.drawImage（原始，0,0,52,60，本）；
g2d.dispose（）；
write（图像，“jpg”，新文件（“test.jpg”）；
}捕获（IOEX异常）{
例如printStackTrace（）；
}
}
@凌驾
公共维度getPreferredSize（）{
维度大小=super.getPreferredSize（）；
如果（原始！=null）{
如果（缩放！=null）{
size.width=original.getWidth（）+scaled.getWidth（）；
size.height=original.getHeight（）；
}否则{
size.width=original.getWidth（）；
size.height=original.getHeight（）；
}
}
返回大小；
}
@凌驾
公共关系
origImage = ImageIO.read(new File(sourceImg));

origImage = Scalr.resize(origImage, Method.ULTRA_QUALITY, 60);

origImage = Scalr.resize(origImage, Method.ULTRA_QUALITY, 60, Scalr.OP_ANTIALIAS);