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--- java:image [2011/11/21 17:55]
kwon37xi
+++ java:image [2023/08/09 17:19] (현재)
kwon37xi
@@ 줄 1: / 줄 1: @@
 ====== Java Image ======
   * [[java:image/resize|java:image/resize]]
+  * [[java:scrimage|scrimage]]
 ===== JAI - Java Advanced Imaging =====
+  * http://java.sun.com/javase/technologies/desktop/media/jai/
+  * [[http://java.sun.com/products/java-media/jai/forDevelopers/jai1_0_1guide-unc/JAITOC.fm.html|Programming in Java Advanced Imaging]]
   * [[http://www.oracle.com/technetwork/java/current-142188.html|JAI Download]]. 전체 설치를 안하고 다음 두가지만 설치해도 된다.
     * [[http://mvnrepository.com/artifact/javax.media/jai_core|jai_core]]
     * [[http://mvnrepository.com/artifact/com.sun.media/jai_codec|jai_codec]]
-  * 기본적으로 Native Library를 사용하도록 돼 있는데, 아래 설정을 통해 이를 방지한다.<code java>
+  * 기본적으로 Native Library를 사용하도록 돼 있는데, 아래 설정을 통해 순수 Java로 사용가능.<code java>
 static {
     System.setProperty("com.sun.media.jai.disableMediaLib", "true");
 }
 </code>
+  * [[http://jaitools.org/|JAITools]]
 ===== Image to BufferedImage =====
 Image 객체를 BufferedImage 객체로 변환하는 방법
   * [[http://www.exampledepot.com/egs/java.awt.image/Image2Buf.html|Creating a Buffered Image from an Image]]
   * [[http://www.exampledepot.com/egs/java.awt.image/HasAlpha.html|Determining If an Image Has Transparent Pixels]] : 위 방법에서 사용하는 hasAlpha 메소드 구현
-  * <code java>
-// This method returns a buffered image with the contents of an image
-public static BufferedImage toBufferedImage(Image image) {
-    if (image instanceof BufferedImage) {
-        return (BufferedImage)image;
-    }
-    // This code ensures that all the pixels in the image are loaded
+===== JAI Crop Image =====
-    image = new ImageIcon(image).getImage();
+  * [[http://www.velocityreviews.com/forums/t146186-jai-example-of-cropping.html|JAI example of cropping]]
+<code java>
+RenderedImage ri = JAI.create(“fileload”,pathandfilename);
-    // Determine if the image has transparent pixels; for this method's
+public void crop() {
-    // implementation, see Determining If an Image Has Transparent Pixels
+  pb = new ParameterBlock();
-    boolean hasAlpha = hasAlpha(image);
+  pb.addSource(ri);
+  pb.add((float)topLeftmx);
+  pb.add((float)topLeftmy);
+  pb.add((float)roiWidth);
+  pb.add((float)roiHeight);
+  ri = JAI.create(“crop”,pb);
+}
+</code>
-    // Create a buffered image with a format that's compatible with the screen
+===== imgscalr =====
-    BufferedImage bimage = null;
+  * [[https://github.com/thebuzzmedia/imgscalr|imgscalr – Java Image Scaling Library]]
-    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
-    try {
-        // Determine the type of transparency of the new buffered image
-        int transparency = Transparency.OPAQUE;
-        if (hasAlpha) {
-            transparency = Transparency.BITMASK;
-        }
-        // Create the buffered image
-        GraphicsDevice gs = ge.getDefaultScreenDevice();
-        GraphicsConfiguration gc = gs.getDefaultConfiguration();
-        bimage = gc.createCompatibleImage(
-            image.getWidth(null), image.getHeight(null), transparency);
-    } catch (HeadlessException e) {
-        // The system does not have a screen
-    }
-    if (bimage == null) {
+===== Twelvemonkeys ImageIO =====
-        // Create a buffered image using the default color model
+  * https://github.com/haraldk/TwelveMonkeys : ImageIO extension plugin
-        int type = BufferedImage.TYPE_INT_RGB;
-        if (hasAlpha) {
-            type = BufferedImage.TYPE_INT_ARGB;
-        }
-        bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
-    }
-    // Copy image to buffered image
+===== WebP =====
-    Graphics g = bimage.createGraphics();
+  * [[https://github.com/lonnyj/webp-imageio|webp-imageio]]
-    // Paint the image onto the buffered image
-    g.drawImage(image, 0, 0, null);
-    g.dispose();
-    return bimage;
-}
-// This method returns true if the specified image has transparent pixels
-public static boolean hasAlpha(Image image) {
-    // If buffered image, the color model is readily available
-    if (image instanceof BufferedImage) {
-        BufferedImage bimage = (BufferedImage)image;
-        return bimage.getColorModel().hasAlpha();
-    }
-    // Use a pixel grabber to retrieve the image's color model;
-    // grabbing a single pixel is usually sufficient
-     PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
-    try {
-        pg.grabPixels();
-    } catch (InterruptedException e) {
-    }
-    // Get the image's color model
-    ColorModel cm = pg.getColorModel();
-    return cm.hasAlpha();
-}
-</code>

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