【代码片】图像处理工具OpenCV、JAI、ImageJ、Thumbnailator和Graphics2D

Graphics2D图像压缩

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.File;public class ImageResolutionModifier {public static void main(String[] args) {// 输入图片路径和输出图片路径String inputImagePath = "D:\\out1.png";String outputImagePath = "D:\\out1-graphics2d.jpg";// 目标宽度和高度int targetWidth = 1024;int targetHeight = 576;try {// 读取输入图片File inputFile = new File(inputImagePath);BufferedImage inputImage = ImageIO.read(inputFile);// 创建缩放后的图像BufferedImage outputImage = new BufferedImage(targetWidth, targetHeight, inputImage.getType());Graphics2D g2d = outputImage.createGraphics();g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);g2d.drawImage(inputImage, 0, 0, targetWidth, targetHeight, null);g2d.dispose();// 写入输出图片文件ImageIO.write(outputImage, "JPEG", new File(outputImagePath));System.out.println("图片分辨率修改成功，并保存到 " + outputImagePath);} catch (Exception e) {System.out.println("图片分辨率修改失败: " + e.getMessage());}}
}

Thumbnailator图像压缩

import net.coobird.thumbnailator.Thumbnails;
import java.io.File;public class ImageResolutionModifier {public static void main(String[] args) {// 输入图片路径和输出图片路径String inputImagePath = "D:\\out1.png";String outputImagePath = "D:\\out1-thumbnailator.jpg";// 目标宽度和高度int targetWidth = 1024;int targetHeight = 576;try {Thumbnails.of(new File(inputImagePath)).size(targetWidth, targetHeight).toFile(new File(outputImagePath));System.out.println("图片分辨率修改成功，并保存到 " + outputImagePath);} catch (Exception e) {System.out.println("图片分辨率修改失败: " + e.getMessage());}}
}

ImageJ图像压缩

import ij.ImagePlus;
import ij.io.FileSaver;
import ij.io.Opener;
import ij.process.ImageProcessor;public class ImageResolutionModifier {public static void main(String[] args) {// 输入图片路径和输出图片路径String inputImagePath = "D:\\out1.png";String outputImagePath = "D:\\out1-imagej.jpg";// 目标宽度和高度int targetWidth = 1024;int targetHeight = 576;try {// 打开输入图片Opener opener = new Opener();ImagePlus imp = opener.openImage(inputImagePath);ImageProcessor ip = imp.getProcessor();// 缩放图片ip = ip.resize(targetWidth, targetHeight);// 创建输出图片ImagePlus outputImage = new ImagePlus("Output Image", ip);// 保存调整分辨率后的图片到输出文件FileSaver fileSaver = new FileSaver(outputImage);fileSaver.saveAsJpeg(outputImagePath);System.out.println("图片分辨率修改成功，并保存到 " + outputImagePath);} catch (Exception e) {System.out.println("图片分辨率修改失败: " + e.getMessage());}}
}

JAI图像压缩

import javax.media.jai.Interpolation;
import javax.media.jai.JAI;
import javax.media.jai.RenderedOp;
import javax.media.jai.operator.ScaleDescriptor;public class ImageResolutionModifier {public static void main(String[] args) {// 输入图片路径和输出图片路径String inputImagePath = "D:\\out1.png";String outputImagePath = "D:\\out1-jai.jpg";// 目标宽度和高度int targetWidth = 1024;int targetHeight = 576;try {// 读取输入图片RenderedOp inputImage = JAI.create("fileload", inputImagePath);// 缩放图片RenderedOp scaledImage = ScaleDescriptor.create(inputImage, targetWidth / (float) inputImage.getWidth(),targetHeight / (float) inputImage.getHeight(), 0.0F, 0.0F, Interpolation.getInstance(Interpolation.INTERP_BICUBIC), null);// 保存调整分辨率后的图片到输出文件JAI.create("filestore", scaledImage, outputImagePath, "JPEG");System.out.println("图片分辨率修改成功，并保存到 " + outputImagePath);} catch (Exception e) {System.out.println("图片分辨率修改失败: " + e.getMessage());}}
}

OpenCV图像压缩

import org.opencv.core.*;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;public class ImageResolutionModifier {public static void main(String[] args) {// 加载 OpenCV 库System.loadLibrary(Core.NATIVE_LIBRARY_NAME);// 输入图片路径和输出图片路径String inputImagePath = "D:\\out1.png";String outputImagePath = "D:\\out1-opencv.jpg";// 目标宽度和高度int targetWidth = 1024;int targetHeight = 576;try {// 读取输入图片Mat inputImage = Imgcodecs.imread(inputImagePath);// 创建目标尺寸的图像Mat resizedImage = new Mat();Size size = new Size(targetWidth, targetHeight);Imgproc.resize(inputImage, resizedImage, size, 0, 0, Imgproc.INTER_AREA);// 保存调整尺寸后的图像Imgcodecs.imwrite(outputImagePath, resizedImage);System.out.println("图片分辨率修改成功，并保存到 " + outputImagePath);} catch (Exception e) {System.out.println("图片分辨率修改失败: " + e.getMessage());}}
}