java 在java中调整jpeg图像的大小
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resize jpeg image in java
提问by janasainik
i am working on image comparison in java. I think before going to compare the images, it is better to process the images for setting a fixed size image. Is there any java functionality to resize the images. I want to rescale the images to 300*225.
我正在 Java 中进行图像比较。我认为在比较图像之前，最好先处理图像以设置固定大小的图像。是否有任何 Java 功能来调整图像大小。我想将图像重新缩放为 300*225。
回答by Bozho
BufferedImage img = ImageIO.read(imageFile);
Image scaled = img.getScaledInstance(300, 255, Image.SCALE_DEFAULT);
You can also take a look at the java-image-scalinglibrary.
您还可以查看java-image-scaling库。
回答by user489041
public ImageIcon resizeImage(String filePath, int w, int h) {
String data = filePath;
BufferedImage bsrc, bdest;
ImageIcon theIcon;
//scale the image
try
{
bsrc = ImageIO.read(new File(data));
bdest = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g = bdest.createGraphics();
AffineTransform at = AffineTransform.getScaleInstance((double) w / bsrc.getWidth(),
(double) h / bsrc.getHeight());
g.drawRenderedImage(bsrc, at);
//add the scaled image
theIcon = new ImageIcon(bdest);
return theIcon;
}
catch (Exception e)
{
System.out.println("This image can not be resized. Please check the path and type of file.");
return null;
}
}
回答by Jigar Joshi
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;
}
