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‎image-processing/pom.xml‎

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<artifactId>tesseract-platform</artifactId>
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<version>${tesseract-platform.version}</version>
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</dependency>
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<dependency>
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<groupId>org.imgscalr</groupId>
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<artifactId>imgscalr-lib</artifactId>
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<version>${imgscalr-version}</version>
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</dependency>
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<dependency>
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<groupId>net.coobird</groupId>
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<artifactId>thumbnailator</artifactId>
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<version>${thumbnailator-version}</version>
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</dependency>
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<dependency>
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<groupId>com.github.downgoon</groupId>
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<artifactId>marvin</artifactId>
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<version>${marvin-version}</version>
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<type>pom</type>
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</dependency>
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<dependency>
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<groupId>com.github.downgoon</groupId>
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<artifactId>MarvinPlugins</artifactId>
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<version>${marvin-version}</version>
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</dependency>
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</dependencies>
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<properties>
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<tess4j.version>4.5.1</tess4j.version>
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<tesseract-platform.version>4.1.0-1.5.2</tesseract-platform.version>
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<opencv.version>3.4.2-0</opencv.version>
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<imgscalr-version>4.2</imgscalr-version>
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<thumbnailator-version>0.4.11</thumbnailator-version>
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<marvin-version>1.5.5</marvin-version>
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</properties>
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</project>

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

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

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

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

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

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

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

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

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

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

‎image-processing/src/test/java/com/baeldung/image/resize/core/Graphics2DExampleUnitTest.java‎

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package com.baeldung.image.resize.core;
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import static org.junit.Assert.assertNotNull;
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import static org.junit.Assert.assertNull;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertNotEquals;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.IOException;
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import javax.imageio.ImageIO;
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import org.junit.Test;
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public class Graphics2DExampleUnitTest {
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@Test(expected = Test.None.class)
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public void whenOriginalImageExistsAndTargetSizesAreNotZero_thenImageGeneratedWithoutError() throws IOException {
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int targetWidth = 200;
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int targetHeight = 200;
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BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
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BufferedImage outputImage = Graphics2DExample.resizeImage(originalImage, targetWidth, targetHeight);
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assertNotNull(outputImage);
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}
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@Test(expected = Test.None.class)
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public void whenOriginalImageExistsAndTargetSizesAreNotZero_thenOutputImageSizeIsValid() throws IOException {
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int targetWidth = 200;
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int targetHeight = 200;
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BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
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assertNotEquals(originalImage.getWidth(), targetWidth);
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assertNotEquals(originalImage.getHeight(), targetHeight);
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BufferedImage outputImage = Graphics2DExample.resizeImage(originalImage, targetWidth, targetHeight);
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assertEquals(outputImage.getWidth(), targetWidth);
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assertEquals(outputImage.getHeight(), targetHeight);
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}
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@Test(expected = Exception.class)
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public void whenTargetWidthIsZero_thenErrorIsThrown() throws IOException {
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int targetWidth = 0;
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int targetHeight = 200;
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BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
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BufferedImage outputImage = Graphics2DExample.resizeImage(originalImage, targetWidth, targetHeight);
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assertNull(outputImage);
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}
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@Test(expected = Exception.class)
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public void whenTargetHeightIsZero_thenErrorIsThrown() throws IOException {
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int targetWidth = 200;
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int targetHeight = 0;
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BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
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BufferedImage outputImage = Graphics2DExample.resizeImage(originalImage, targetWidth, targetHeight);
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assertNull(outputImage);
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}
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@Test(expected = Test.None.class)
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public void whenOriginalImageDoesNotExist_thenErrorIsNotThrownAndImageIsGenerated() throws IOException {
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int targetWidth = 200;
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int targetHeight = 200;
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BufferedImage outputImage = Graphics2DExample.resizeImage(null, targetWidth, targetHeight);
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assertNotNull(outputImage);
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assertEquals(outputImage.getWidth(), targetWidth);
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assertEquals(outputImage.getHeight(), targetHeight);
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}
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}

‎image-processing/src/test/java/com/baeldung/image/resize/core/ImageScaledInstanceExampleUnitTest.java‎

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package com.baeldung.image.resize.core;
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import static org.junit.Assert.assertNotNull;
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import static org.junit.Assert.assertNull;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertNotEquals;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.IOException;
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import javax.imageio.ImageIO;
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import org.junit.Test;
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public class ImageScaledInstanceExampleUnitTest {
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@Test(expected = Test.None.class)
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public void whenOriginalImageExistsAndTargetSizesAreNotZero_thenImageGeneratedWithoutError() throws IOException {
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int targetWidth = 200;
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int targetHeight = 200;
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BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
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BufferedImage outputImage = ImageScaledInstanceExample.resizeImage(originalImage, targetWidth, targetHeight);
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assertNotNull(outputImage);
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}
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@Test(expected = Test.None.class)
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public void whenOriginalImageExistsAndTargetSizesAreNotZero_thenOutputImageSizeIsValid() throws IOException {
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int targetWidth = 200;
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int targetHeight = 200;
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BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
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assertNotEquals(originalImage.getWidth(), targetWidth);
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assertNotEquals(originalImage.getHeight(), targetHeight);
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BufferedImage outputImage = ImageScaledInstanceExample.resizeImage(originalImage, targetWidth, targetHeight);
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assertEquals(outputImage.getWidth(), targetWidth);
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assertEquals(outputImage.getHeight(), targetHeight);
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}
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@Test(expected = Exception.class)
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public void whenTargetWidthIsZero_thenErrorIsThrown() throws IOException {
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int targetWidth = 0;
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int targetHeight = 200;
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BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
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BufferedImage outputImage = ImageScaledInstanceExample.resizeImage(originalImage, targetWidth, targetHeight);
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assertNull(outputImage);
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}
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@Test(expected = Exception.class)
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public void whenTargetHeightIsZero_thenErrorIsThrown() throws IOException {
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int targetWidth = 200;
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int targetHeight = 0;
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BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
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BufferedImage outputImage = ImageScaledInstanceExample.resizeImage(originalImage, targetWidth, targetHeight);
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assertNull(outputImage);
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}
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@Test(expected = Exception.class)
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public void whenOriginalImageDoesNotExist_thenErrorIsThrown() throws IOException {
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int targetWidth = 200;
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int targetHeight = 200;
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BufferedImage outputImage = ImageScaledInstanceExample.resizeImage(null, targetWidth, targetHeight);
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assertNull(outputImage);
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}
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}

‎image-processing/src/test/java/com/baeldung/image/resize/imgscalr/ImgscalrExampleUnitTest.java‎

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package com.baeldung.image.resize.imgscalr;
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import static org.junit.Assert.assertNotNull;
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import static org.junit.Assert.assertNull;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertNotEquals;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.IOException;
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import javax.imageio.ImageIO;
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import org.junit.Test;
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public class ImgscalrExampleUnitTest {
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@Test(expected = Test.None.class)
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public void whenOriginalImageExistsAndTargetSizesAreNotZero_thenImageGeneratedWithoutError() throws IOException {
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int targetWidth = 200;
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int targetHeight = 200;
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BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
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BufferedImage outputImage = ImgscalrExample.resizeImage(originalImage, targetWidth, targetHeight);
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assertNotNull(outputImage);
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}
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@Test(expected = Test.None.class)
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public void whenOriginalImageExistsAndTargetSizesAreNotZero_thenOutputImageSizeIsValid() throws IOException {
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int targetWidth = 200;
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int targetHeight = 200;
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BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
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assertNotEquals(originalImage.getWidth(), targetWidth);
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assertNotEquals(originalImage.getHeight(), targetHeight);
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BufferedImage outputImage = ImgscalrExample.resizeImage(originalImage, targetWidth, targetHeight);
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assertEquals(outputImage.getWidth(), targetWidth);
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assertEquals(outputImage.getHeight(), targetHeight);
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}
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@Test(expected = Test.None.class)
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public void whenTargetWidthIsZero_thenImageIsCreated() throws IOException {
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int targetWidth = 0;
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int targetHeight = 200;
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BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
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BufferedImage outputImage = ImgscalrExample.resizeImage(originalImage, targetWidth, targetHeight);
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assertNotNull(outputImage);
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}
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@Test(expected = Test.None.class)
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public void whenTargetHeightIsZero_thenImageIsCreated() throws IOException {
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int targetWidth = 200;
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int targetHeight = 0;
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BufferedImage originalImage = ImageIO.read(new File("src/main/resources/images/sampleImage.jpg"));
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BufferedImage outputImage = ImgscalrExample.resizeImage(originalImage, targetWidth, targetHeight);
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assertNotNull(outputImage);
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}
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@Test(expected = Exception.class)
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public void whenOriginalImageDoesNotExist_thenErrorIsThrown() {
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int targetWidth = 200;
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int targetHeight = 200;
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BufferedImage outputImage = ImgscalrExample.resizeImage(null, targetWidth, targetHeight);
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assertNull(outputImage);
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}
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}

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