From a Java Game Engine: /** * Converts a given Image into a BufferedImage * * @param img The Image to be converted * @return The converted BufferedImage */ public static BufferedImage toBufferedImage(Image img) { if (img instanceof BufferedImage) { return (BufferedImage) img; } // Create a buffered image with transparency BufferedImage bimage = new … Read more
First filter(), as shown here, and then scale using drawImage() or AffineTransformOp, as shown here. Addendum: Alternatively, you can scale the image first (using either approach above) and then use your RescaleOp in drawImage(). As an aside, RescaleOp scales the image’s color bands; it does not change the image’s dimensions. To avoid confusion, dimensional scaling … Read more
Something like this? static BufferedImage deepCopy(BufferedImage bi) { ColorModel cm = bi.getColorModel(); boolean isAlphaPremultiplied = cm.isAlphaPremultiplied(); WritableRaster raster = bi.copyData(null); return new BufferedImage(cm, raster, isAlphaPremultiplied, null); }
Never use Thread.sleep() when code is executing on the Event Dispatch Thread. Instead you should use a Swing Timer to schedule your animation. See the sections from the Swing tutorial on: Concurrency in Swing How to Use Timers Or if you don’t want to use a Timer, then you can use a SwingWorker (as described … Read more
AffineTransformOp offers the additional flexibility of choosing the interpolation type. BufferedImage before = getBufferedImage(encoded); int w = before.getWidth(); int h = before.getHeight(); BufferedImage after = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB); AffineTransform at = new AffineTransform(); at.scale(2.0, 2.0); AffineTransformOp scaleOp = new AffineTransformOp(at, AffineTransformOp.TYPE_BILINEAR); after = scaleOp.filter(before, after); The fragment shown illustrates resampling, not cropping; this related … Read more
The method drawString() uses x and y for the leftmost character’s baseline. Numbers typically have no descenders; if the same is true of text, a string drawn at position (0,0) will be rendered entirely outside the image. See this example. Addendum: You may be having trouble with an incompatible color model in your image. One … Read more
I was just playing around with this same subject, which is the fastest way to access the pixels. I currently know of two ways for doing this: Using BufferedImage’s getRGB() method as described in @tskuzzy’s answer. By accessing the pixels array directly using: byte[] pixels = ((DataBufferByte) bufferedImage.getRaster().getDataBuffer()).getData(); If you are working with large images … Read more
Here first watch this small example, do let me know if you understood what is going on in here. Then only we will go a step further, slowly slowly. Try to go through this example, in which I am showing you how to draw on a JPanel import java.awt.*; import java.awt.image.BufferedImage; import java.io.IOException; import java.net.URL; … Read more