initial commit

image-processing/src/main/java/com/baeldung/image/resize/core/Graphics2DExample.java

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+package com.baeldung.image.resize.core;
+
+import java.awt.Graphics2D;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+
+import javax.imageio.ImageIO;
+
+public class Graphics2DExample {
+
+    static BufferedImage resizeImage(BufferedImage originalImage, int targetWidth, int targetHeight) {
+        BufferedImage resizedImage = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_RGB);
+        Graphics2D graphics2D = resizedImage.createGraphics();
+        graphics2D.drawImage(originalImage, 0, 0, targetWidth, targetHeight, null);
+        graphics2D.dispose();
+        return resizedImage;
+    }
+
+    public static void main(String[] args) throws IOException {
+        BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
+        BufferedImage outputImage = resizeImage(originalImage, 200, 200);
+        ImageIO.write(outputImage, "jpg", new File("src/main/resources/images/sampleImage-resized-graphics2d.jpg"));
+    }
+}

image-processing/src/main/java/com/baeldung/image/resize/core/ImageScaledInstanceExample.java

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+package com.baeldung.image.resize.core;
+
+import java.awt.Image;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+
+import javax.imageio.ImageIO;
+
+public class ImageScaledInstanceExample {
+    static BufferedImage resizeImage(BufferedImage originalImage, int targetWidth, int targetHeight) {
+        Image resultingImage = originalImage.getScaledInstance(targetWidth, targetHeight, Image.SCALE_DEFAULT);
+        BufferedImage bufferedImage = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_RGB);
+        bufferedImage.getGraphics()
+            .drawImage(resultingImage, 0, 0, null);
+        return bufferedImage;
+    }
+
+    public static void main(String[] args) throws IOException {
+        BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
+        BufferedImage outputImage = resizeImage(originalImage, 200, 200);
+        ImageIO.write(outputImage, "jpg", new File("src/main/resources/images/sampleImage-resized-scaledinstance.jpg"));
+    }
+}

image-processing/src/main/java/com/baeldung/image/resize/imgscalr/ImgscalrExample.java

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+package com.baeldung.image.resize.imgscalr;
+
+import java.awt.image.BufferedImage;
+import java.io.File;
+
+import javax.imageio.ImageIO;
+
+import org.imgscalr.Scalr;
+
+public class ImgscalrExample {
+    public static BufferedImage simpleResizeImage(BufferedImage originalImage, int targetWidth) {
+        return Scalr.resize(originalImage, targetWidth);
+    }
+
+    public static BufferedImage resizeImage(BufferedImage originalImage, int targetWidth, int targetHeight) {
+        return Scalr.resize(originalImage, Scalr.Method.AUTOMATIC, Scalr.Mode.AUTOMATIC, targetWidth, targetHeight, Scalr.OP_ANTIALIAS);
+    }
+
+    public static void main(String[] args) throws Exception {
+        BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
+        BufferedImage outputImage = resizeImage(originalImage, 200, 200);
+        ImageIO.write(outputImage, "jpg", new File("src/main/resources/images/sampleImage-resized-imgscalr.jpg"));
+    }
+}

image-processing/src/main/java/com/baeldung/image/resize/marvin/MarvinExample.java

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+package com.baeldung.image.resize.marvin;
+
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+
+import javax.imageio.ImageIO;
+
+import org.marvinproject.image.transform.scale.Scale;
+
+import marvin.image.MarvinImage;
+
+public class MarvinExample {
+    static BufferedImage resizeImage(BufferedImage originalImage, int targetWidth, int targetHeight) {
+        MarvinImage image = new MarvinImage(originalImage);
+        Scale scale = new Scale();
+        scale.load();
+        scale.setAttribute("newWidth", targetWidth);
+        scale.setAttribute("newHeight", targetHeight);
+        scale.process(image.clone(), image, null, null, false);
+        return image.getBufferedImageNoAlpha();
+    }
+
+    public static void main(String args[]) throws IOException {
+        BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
+        BufferedImage outputImage = resizeImage(originalImage, 200, 200);
+        ImageIO.write(outputImage, "jpg", new File("src/main/resources/images/sampleImage-resized-marvin.jpg"));
+    }
+}

image-processing/src/main/java/com/baeldung/image/resize/thumbnailator/ThumbnailatorExample.java

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+package com.baeldung.image.resize.thumbnailator;
+
+import java.awt.image.BufferedImage;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.IOException;
+
+import javax.imageio.ImageIO;
+
+import net.coobird.thumbnailator.Thumbnails;
+
+public class ThumbnailatorExample {
+    static BufferedImage resizeImage(BufferedImage originalImage, int targetWidth, int targetHeight) throws IOException {
+        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
+        Thumbnails.of(originalImage)
+            .size(targetWidth, targetHeight)
+            .outputFormat("JPEG")
+            .outputQuality(0.90)
+            .toOutputStream(outputStream);
+        byte[] data = outputStream.toByteArray();
+        ByteArrayInputStream inputStream = new ByteArrayInputStream(data);
+        return ImageIO.read(inputStream);
+    }
+
+    public static void main(String[] args) throws Exception {
+        BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
+        BufferedImage outputImage = resizeImage(originalImage, 200, 200);
+        ImageIO.write(outputImage, "jpg", new File("src/main/resources/images/sampleImage-resized-thumbnailator.jpg"));
+    }
+}