如何在调整大小后将Java中的DPI从96更改为300？ [英] How to change the DPI from 96 to 300 of an image in java after resizing?

问题描述

我有一个JPEG图像，在调整大小后，我想将Java中的DPI从96改为300到300。我的代码：

I have a JPEG image, after resizing it, I want to change the DPI from 96 to 300 of same image in Java. My code:

public BufferedImage resizeImageWithHint(BufferedImage originalImage, int type) {
    BufferedImage resizedImage = new BufferedImage(177, 177, type);
    Graphics2D g = resizedImage.createGraphics();
    g.drawImage(originalImage, 0, 0, 177, 177, 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);    //g.translate(4, 4);     return resizedImage;         }

推荐答案

BufferedImage image = ImageIO.read(new File(path));
JPEGImageEncoder jpegEncoder = JPEGCodec.createJPEGEncoder(new FileOutputStream(new File(path)));
JPEGEncodeParam jpegEncodeParam = jpegEncoder.getDefaultJPEGEncodeParam(image);
jpegEncodeParam.setDensityUnit(JPEGEncodeParam.DENSITY_UNIT_DOTS_INCH);
jpegEncoder.setJPEGEncodeParam(jpegEncodeParam); jpegEncodeParam.setQuality(0.75f, false);
jpegEncodeParam.setXDensity(300); jpegEncodeParam.setYDensity(300);
jpegEncoder.encode(image, jpegEncodeParam);
image.flush();

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