import java.awt.Graphics2D;
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import java.awt.Image;
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import java.awt.RenderingHints;
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import java.awt.image.BufferedImage;
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import java.awt.image.ConvolveOp;
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import java.awt.image.Kernel;
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import java.awt.MediaTracker;
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import java.awt.Container;
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import java.awt.Toolkit;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.net.FileNameMap;
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import java.net.URLConnection;
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import javax.imageio.ImageIO;
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import javax.imageio.ImageWriter;
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import javax.imageio.ImageWriteParam;
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import javax.imageio.stream.FileImageOutputStream;
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import javax.imageio.IIOImage;
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import java.lang.Integer;
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/*
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Java-Code zum Verkleinern von Bildern
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args[0] - Anzahl Pixel an der laengsten Kante
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args[1] - qualitaet JPEG, z.B. 0.75 fuer 75% des Originals
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args[2] - Eingangsordner
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args[3] - Ausgabeordner
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*/
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FileNameMap fileNameMap = URLConnection.getFileNameMap();
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int width = Integer.parseInt(args[0]);
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int height = width;
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String inDirName = args[2];
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String outDirName = args[3];
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File inFile = new File(inDirName);
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File[] fileList = inFile.listFiles();
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if(fileList != null && fileList.length > 0) {
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for(int i = 0; i < fileList.length; i++) {
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System.out.println(fileList[i].getAbsolutePath());
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File outDir = new File(outDirName);
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File outFile = new File(outDir, fileList[i].getName());
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System.out.println(outFile.getAbsolutePath());
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Image image = ImageIO.read(fileList[i]);
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MediaTracker mediaTracker = new MediaTracker(new Container());
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mediaTracker.addImage(image, 0);
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try {
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mediaTracker.waitForID(0);
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if (!mediaTracker.isErrorAny()) {
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float quality = Float.parseFloat(args[1]);
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float factor = (float) 0.0;
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BufferedImage thumbImage;
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int imageWidth = image.getWidth(null);
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int imageHeight = image.getHeight(null);
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int thumbWidth = width;
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int thumbHeight = height;
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if(imageWidth < width) {
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thumbWidth = imageWidth;
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}
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if(imageHeight < height) {
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thumbHeight = imageHeight;
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}
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double thumbRatio = (double)thumbWidth / (double)thumbHeight;
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double imageRatio = (double)imageWidth / (double)imageHeight;
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if (thumbRatio < imageRatio) {
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thumbHeight = (int)(thumbWidth / imageRatio);
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}
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else {
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thumbWidth = (int)(thumbHeight * imageRatio);
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}
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String mimeType = fileNameMap.getContentTypeFor("file://" + fileList[i].getAbsolutePath());
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// draw original image to thumbnail image object and
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// scale it to the new size on-the-fly
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if(mimeType.contains("jpeg") || mimeType.contains("png")) {
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thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);
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} else {
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thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_ARGB);
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}
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Graphics2D graphics2D = thumbImage.createGraphics();
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graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
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graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);
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// 30.7.2007: sharpening hinzugefuegt (Anfang)
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//float factor = -0.15f; // minus = sharpen, plus = soften
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//float[] sharpenArray = {0, -1, 0, -1, 5, -1, 0, -1, 0};
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/*
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30.6.2013: sharpening als Weichmacher nur, wenn Bild < 400
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*/
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/*if(thumbWidth < 400 || thumbHeight < 400) {
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factor = 0.1f;
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}*/
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if(factor != (float) 0.0) {
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//float[] array = {0, factor, 0, factor, 1-(factor*4), factor, 0, factor, 0};
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float[] array = new float[9];
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array[0] = 0;
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array[1] = factor;
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array[2] = 0;
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array[3] = factor;
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array[4] = 1-(factor*4);
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array[5] = factor;
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array[6] = 0;
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array[7] = factor;
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array[8] = 0;
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Kernel kernel = new Kernel(3, 3, array);
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ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
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thumbImage = cOp.filter(thumbImage, null);
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}
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// 30.7.2007: sharpening hinzugefuegt (Ende)
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String imgType;
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if(mimeType.contains("jpg")) {
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imgType = "jpg";
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} else if(mimeType.contains("jpeg")) {
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imgType = "jpg";
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} else if(mimeType.contains("png")) {
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imgType = "png";
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} else if(mimeType.contains("gif")) {
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imgType = "gif";
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} else {
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imgType = "jpg";
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}
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/*
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14.1.2018: Ausgabe um Qualitaetsparameter erweitert
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Beginn
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*/
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ImageWriter writer = ImageIO.getImageWritersByFormatName(imgType).next();
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ImageWriteParam iwp = writer.getDefaultWriteParam();
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iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
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iwp.setCompressionQuality(quality);
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writer.setOutput(new FileImageOutputStream(outFile));
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writer.write(null, new IIOImage(thumbImage, null, null), iwp);
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writer.dispose();
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/* 14.1.2018 Ende */
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}
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} catch (InterruptedException ex) {
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System.out.println("Error: " + ex.getLocalizedMessage());
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}
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}
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} else {
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System.out.println("fileList is null or empty");
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}
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