+ /**
+ * Propose list of thumbnail dimensions.
+ */
+ public static List<Dimension> getThumbnailDimensions(Dimension current) {
+ final ArrayList<Dimension> result = new ArrayList<>();
+ result.add(current);
+
+ while (current.getArea() > 1000000) {
+ current = current.getScaled(0.5d);
+ result.add(current);
+ }
+
+ return result;
+
+ }
+
+ public static void makeThumbnail(final File inputFile,
+ final File outputFile,
+ final java.awt.Dimension preferredTargetDimensions) {
+
+ try {
+
+ final BufferedImage inputImage = Utils.getBufferedImage(inputFile);
+
+ final java.awt.Dimension sourceImageDimension = new java.awt.Dimension(
+ inputImage.getWidth(), inputImage.getHeight());
+
+ final java.awt.Dimension targetDimensions = getTargetThumbnailDimension(
+ sourceImageDimension, preferredTargetDimensions);
+
+ final OutputStream out = new FileOutputStream(outputFile);
+
+ final Image scaledImage = scaleImage(inputImage,
+ targetDimensions.width, targetDimensions.height);
+
+ final BufferedImage bufferedImage = new BufferedImage(
+ scaledImage.getWidth(null), scaledImage.getHeight(null),
+ BufferedImage.TYPE_INT_RGB);
+
+ final Graphics2D g = bufferedImage.createGraphics();
+ g.drawImage(scaledImage, 0, 0, null);
+ g.dispose();
+
+ ImageIO.write(bufferedImage, "jpg", out);
+ out.close();
+
+ } catch (final Exception exception) {
+ System.out.println(exception.toString());
+ exception.printStackTrace();
+ }
+ }