bufferedimage

问题 I am trying to change the lsb value of image pixels such that it matches with the string "abc" but adding 1 or 0 to a pixel with odd value is returning 0. here is the code: public static void main(String[] args) { BufferedImage img = null; try { img = ImageIO.read(new File("a.jpg")); } catch (IOException ex) { } int pixel[] = img.getRGB(0, 0, img.getWidth(), img.getHeight(), null, 0, img.getWidth()); String s = "abc"; byte[] b = s.getBytes(); String f = ""; for (int i = 0; i < b.length; i++)

问题 I have a BufferedImage and I am trying to fill a rectangle with transparent pixels. The problem is, instead of replacing the original pixels, the transparent pixels just go on top and do nothing. How can I get rid of the original pixel completely? The code works fine for any other opaque colors. public static BufferedImage[] slice(BufferedImage img, int slices) { BufferedImage[] ret = new BufferedImage[slices]; for (int i = 0; i < slices; i++) { ret[i] = copyImage(img); Graphics2D g2d = ret[i

问题 Any other errors aside, I need a way of converting my Color grayScale into an int. When I plug in the Color, I get an error. setRGB method takes an x, a y, and an rgb int as parameters. How do I change my Color into an int? import java.awt.*; import java.awt.event.*; import java.util.*; import java.io.*; import javax.swing.*; import java.awt.image.*; import javax.imageio.ImageIO; public class Picture{ Container content; BufferedImage image, image2; public Picture(String filename) { File f =

问题 I've seen several examples of making compressed JPG images from Java BufferedImage objects by writing to file, but is it possible to perform JPG compression without writing to file? Perhaps by writing to a ByteArrayOutputStream like this? ImageWriter jpgWriter = ImageIO.getImageWritersByFormatName("jpg").next(); ImageWriteParam jpgWriteParam = jpgWriter.getDefaultWriteParam(); jpgWriteParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT); jpgWriteParam.setCompressionQuality(0.7f);

问题 I am having problems converting a colored image with some transparent pixels to grayscale. I have searched and found related questions on this website but nothing I have been able to use to solve my problem. I have defined a method "convertType" as follows: /*------------------------------ attempts to convert the type of the image argument to the chosen type for example: BufferedImage newImage= ImageUtilities.convertType(oldImage, BufferedImage.TYPE_3BYTE_BGR); 11/28/2013 WARNING-it remains

问题 Anyone know of a simple way of converting the RGBint value returned from <BufferedImage> getRGB(i,j) into a greyscale value? I was going to simply average the RGB values by breaking them up using this; int alpha = (pixel >> 24) & 0xff; int red = (pixel >> 16) & 0xff; int green = (pixel >> 8) & 0xff; int blue = (pixel) & 0xff; and then average red,green,blue. But i feel like for such a simple operation I must be missing something... After a great answer to a different question, I should clear

问题 I'm trying to write 16 bit grayscale imagedata to a png using BufferedImage.TYPE_USHORT_GRAY. Normally I write to an image like so: BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB); then: image.setRGB(x,y,Color.getRGB); to set the pixels, and finally: ImageIO.write(image, "png", new File(path + ".png")); to write to a png image. But now I have this as image: BufferedImage imageGray = new BufferedImage(width, height, BufferedImage.TYPE_USHORT_GRAY); How do I

问题 How can I make an image border as gradient. I googled a lot, but didn't find correct suggestion. Any one can help me... Any suggestion please... 回答1: This is an interesting one. I first thought that there should be a simple solution, using some Graphics#drawRoundRect call with the appropriate Paint , but it's not sooo simple. However, one solution is implemented in the following example: The image is painted as-it-is into a new image. Then the edges and corners are painted. These consist of

问题 I am drawing an animation onto a swing JPanel. The 1024x1024 screen is divided up into 2000 pieces which cover the screen exactly (no overlap). each piece is a very small piece of the screen (1/2000'th of it). The animation draws one piece every millisecond by changing the pixels in the buffered image and calling reaint(). So at the entire screen changes every 2 seconds. The animation is run in a java.util.Timer task. The buffered image is not accelerated and is not volatile. I set it's

问题 It's the original image: I use java.awt.Graphics.fillRect(int x, int y, int width, int height) to add a coloured rectangle on the image. Graphics imageGraphics = image.createGraphics(); Color color = new Color(0,0,0,100); imageGraphics.setColor(color); imageGraphics.fillRect(0, 0, 800, 600); So the image has been inverted and looks like this: After that,I want to clear the black transparent rectangle partly and show the original image. imageGraphics.clearRect(100,100,100,100); But the effect