Transparancy [fairly simple]

[elamre]

Hello, im trying to work with transparancy. So i have copy'd the following code:
now this 0xFF00FF00 used to be 0xFF0000 for blue. But i have changed to make it work with purple/pink. However this does not seem to work.
Can anybody help me out with this simple question?

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private Image setTransparency(BufferedImage image){       ImageFilter filter = new RGBImageFilter(){          public final int filterRGB(int x, int y, int rgb){             return (rgb << 8) & 0xFF00FF00;                  //0xFF(255.)00(0.)FF(255.)00(0) r,g,b,t         }       };       ImageProducer ip = new FilteredImageSource(image.getSource(), filter);       return Toolkit.getDefaultToolkit().createImage(ip);    }

[GabrielBailey74]

One second, i'll post all methods needed =D.

The color of course:


The actual transparent method, similar to yours:

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private static BufferedImage makeTransparent(BufferedImage tmpImage) {         int h = tmpImage.getHeight(null);         int w = tmpImage.getWidth(null);         BufferedImage resultImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);         int transparentColor = tmpImage.getRGB(0,0);           for (int y = 0; y < h; y++)           for (int x = 0; x < w; x++)  {             int color = tmpImage.getRGB(x, y);             if (color == transparentColor) {                color = color & 0x00FFFFFF; // clear the alpha flag            }                resultImage.setRGB(x, y, color);           }         return resultImage;    }

The method where you would actually pass the images through transparency in the method above(Example commented out)

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public static void makeTransparents() throws Exception {       try {           //BufferedImage tmp0 = ImageIO.read(new File("storage/sprites/interfaces/hud0.png"));         //hud0 = makeTransparent(tmp0);          SystemOut.append("[Transparent Image Created.");          SystemOut.append("==== FINISHED CALLING TRANSPARENT IMAGES ====");       } catch (FileNotFoundException e3) {          System.out.println("File not found.");          e3.printStackTrace();       }    }

The whole TransparentImage class (if needed):

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import java.awt.image.BufferedImage; import java.io.File; import java.io.FileNotFoundException; import javax.imageio.ImageIO; import server.system.print.SystemOut; public class TransparentImage {    public static BufferedImage hud0; //Define the BufferedImage   public static int tps = 0;    public static boolean loaded = false;    public static SystemOut so = new SystemOut(); //Ignore      public TransparentImage() {    }        public static void makeTransparents() throws Exception {       try {           BufferedImage tmp0 = ImageIO.read(new File("storage/sprites/interfaces/hud0.png")); //Specify the file path.         hud0 = makeTransparent(tmp0); //Pass that BufferedImage through our "makeTransparent()" method          SystemOut.append("[Transparent Image Created.");          SystemOut.append("==== FINISHED CALLING TRANSPARENT IMAGES ====");       } catch (FileNotFoundException e3) {          System.out.println("File not found.");          e3.printStackTrace();       }    }        private static BufferedImage makeTransparent(BufferedImage tmpImage) {         int h = tmpImage.getHeight(null);         int w = tmpImage.getWidth(null);         BufferedImage resultImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);         int transparentColor = tmpImage.getRGB(0,0);           for (int y = 0; y < h; y++)           for (int x = 0; x < w; x++)  {             int color = tmpImage.getRGB(x, y);             if (color == transparentColor) {                color = color & 0x00FFFFFF; // clear the alpha flag            }                resultImage.setRGB(x, y, color);           }         return resultImage;    }     }

[elamre]

Thanks a lot! why wasnt my function working though?
and what does this line do:

1

rgb << 8

Ive made with your code the following sprite code(first time im using sprite sheets. seems useful!   )

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import java.awt.Image; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; public class Sprite {    BufferedImage imgSheet;    //TODO -> use the Offset   private int xOffset, yOffset, x, y, size;            Sprite( int x , int y, int offset, int size){       init();       this.x = x;       this.size = size;       this.y=y;       setImage();       xOffset = x+offset;       yOffset = y+offset;    }        void setImage(){          }        void init(){       try {          imgSheet = ImageIO.read(new File("sheet.png"));       } catch (IOException e) {          System.out.println("Error while loading image sheet! \n Program will now abort.");          e.printStackTrace();       }          }    //Returns the corresponding image   public Image getImage(){       return setTransparency(imgSheet.getSubimage(x*size+xOffset, y*size+yOffset, size, size));    }        private Image setTransparency(BufferedImage image){         int h = image.getHeight(null);         int w = image.getWidth(null);         BufferedImage resultImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);         int transparentColor = image.getRGB(0,0);           for (int y = 0; y < h; y++)           for (int x = 0; x < w; x++)  {             int color = image.getRGB(x, y);             if (color == transparentColor) {                color = color & 0x00FFFFFF; // clear the alpha flag            }                resultImage.setRGB(x, y, color);           }         return resultImage;    } }

Games published by our own members! Check 'em out!

[GabrielBailey74]

Java Operators:
http://docs.oracle.com/javase/tutorial/java/nutsandbolts/operators.html
Haven't used that operator myself yet :/

[ReBirth]

Shifting. If you had met binary then you'll know. That means to shift all bits to left for 8 steps according to the "arrow". So N >> 1 equals N / 2.

[elamre]

Shifting. If you had met binary then you'll know. That means to shift all bits to left for 8 steps according to the "arrow". So N >> 1 equals N / 2.

I remember my teacher saying something about that, only that was with microcontrollers and in c >>. But thanks for the heads-up!

Anyways i have a small problem while trying to draw text. If the text does not have pink in it, then the black will become transparent. And sometimes the pink doesnt get transparent. I use rather much code, i hope somebody can be bothered to see my problem!

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import java.awt.Graphics; import java.awt.Image; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.ImageIO; public class TextChar {        BufferedImage imgSheet;    Image Char;    private int xPosition, yPosition;            TextChar(int xPosition, int yPosition, int x, int y, int offset, int size){       this.xPosition = xPosition;       this.yPosition = yPosition;       try {          imgSheet = ImageIO.read(new File("charSheet.png"));       } catch (IOException e) {          System.out.println("Error while loading image sheet! \n Program will now abort.");          e.printStackTrace();       }       Char = setTransparency(imgSheet.getSubimage(x*size+x+offset, y*size+y+offset, size, size));    }    TextChar(int xPosition, int yPosition, int x, int y, int offset, int size, int useless){       this.xPosition = xPosition;       this.yPosition = yPosition;       try {          imgSheet = ImageIO.read(new File("charSheet.png"));       } catch (IOException e) {          System.out.println("Error while loading image sheet! \n Program will now abort.");          e.printStackTrace();       }       Char = imgSheet.getSubimage(x*size+x+offset, y*size+y+offset, size, size);    }        private Image setTransparency(BufferedImage image){         int h = image.getHeight(null);         int w = image.getWidth(null);         BufferedImage resultImage = new BufferedImage(w, h, BufferedImage.TYPE_INT_ARGB);         int transparentColor = image.getRGB(0,0);           for (int y = 0; y < h; y++)           for (int x = 0; x < w; x++)  {             int color = image.getRGB(x, y);             if (color == transparentColor) {                color = color & 0x00FFFFFF; // clear the alpha flag            }                resultImage.setRGB(x, y, color);           }         return resultImage;    }        public void draw(Graphics g){       g.drawImage(Char, xPosition, yPosition, null);    } }

And my Line class, which will make for each char an object:

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import java.awt.Graphics; import java.util.ArrayList; public class TextLine {    private ArrayList<TextChar> characters;    //TextChar(int xPosition, int yPosition, int x, int y, int offset, int size)   TextLine(int x, int y, String line){       characters = new ArrayList<TextChar>();        char[] stringArray;        stringArray = line.toCharArray();        for(int i = 0; i<stringArray.length;i++){           switch(stringArray[i]){           case 'a':              characters.add(new TextChar(x+i*6,y,0,0,1,7));              break;           case 'b':              characters.add(new TextChar(x+i*6,y,1,0,1,7));              break;           case 'c':              characters.add(new TextChar(x+i*6,y,2,0,1,7));              break;           case 'd':              characters.add(new TextChar(x+i*6,y,3,0,1,7));              break;           case 'e':              characters.add(new TextChar(x+i*6,y,4,0,1,7));              break;           case 'f':              characters.add(new TextChar(x+i*6,y,5,0,1,7));              break;           case 'g':              characters.add(new TextChar(x+i*6,y,6,0,1,7));              break;           case 'h':              characters.add(new TextChar(x+i*6,y,7,0,1,7));              break;           case 'i':              characters.add(new TextChar(x+i*6,y,8,0,1,7));              break;           case 'j':              characters.add(new TextChar(x+i*6,y,9,0,1,7));              break;           case 'k':              characters.add(new TextChar(x+i*6,y,0,1,1,7));              break;           case 'l':              characters.add(new TextChar(x+i*6,y,1,1,1,7));              break;           case 'm':              characters.add(new TextChar(x+i*6,y,2,1,1,7,1));              break;           case 'n':              characters.add(new TextChar(x+i*6,y,3,1,1,7,1));              break;           case 'o':              characters.add(new TextChar(x+i*6,y,4,1,1,7));              break;           case 'p':              characters.add(new TextChar(x+i*6,y,5,1,1,7));              break;           case 'q':              characters.add(new TextChar(x+i*6,y,6,1,1,7));              break;           case 'r':              characters.add(new TextChar(x+i*6,y,7,1,1,7));              break;           case 's':              characters.add(new TextChar(x+i*6,y,8,0,1,7));              break;           case 't':              characters.add(new TextChar(x+i*6,y,9,0,1,7));              break;           case 'u':              characters.add(new TextChar(x+i*6,y,0,2,1,7));              break;           case 'v':              characters.add(new TextChar(x+i*6,y,1,2,1,7));              break;           case 'w':              characters.add(new TextChar(x+i*6,y,2,2,1,7));              break;           case 'x':              characters.add(new TextChar(x+i*6,y,3,2,1,7));              break;           case 'y':              characters.add(new TextChar(x+i*6,y,4,2,1,7,1));              break;           case 'z':              characters.add(new TextChar(x+i*6,y,5,2,1,7,1));              break;           }        }    }        public void draw(Graphics g){       for(int i = 0; i<characters.size(); i++){          TextChar m = (TextChar)characters.get(i);             m.draw(g);       }    } }

Screenshot of the problem (i have used 2 ways, right is the normal one, and left is the one with another constructor for some of the problematic chars, which wont make it transparent)

http://img189.imageshack.us/img189/3500/transparencybug.png <- Bigger size. on the other one you wont be able to see it

[ReBirth]

Crap! what a big screen you have there
My real study is microcontroller so I know that before +=.

btt, your code looks fine. Need deep thought to find out

[GabrielBailey74]

Uploading a Image atm sec.

Could be the image 
If you can see it:


Look real close, it looks like you're first chars are spaced fine, than towards the edge you're cutting them a little closer:
Not giving enough space between chars for the transparency to fill it.

[elamre]

So how would i fix this? do i need bigger letters? (The horror of making them all over again! ><)
Also why is my black getting transparent then? any ideas?