x2pgm

import java.util.*;
import javax.imageio.*;
import java.io.*;
import java.awt.*;
import java.awt.image.*;

/*
    x2pgm - converts various file formats to pgm
    Copyright (C) 2006  Philipp Haussleiter

    This program is free software; you can redistribute it and/or modify it under the terms of the GNU General 
    Public License as published by the Free Software Foundation; either version 2 of the License, or (at your 
    option) any later version.

    This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the 
    implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 
    for more details.

    You should have received a copy of the GNU General Public License along with this program; if not, write to 
    the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA 
 */

class Color2GrayFilter extends RGBImageFilter {

    int red,green,blue;
    int A=100;int B=100;int C=100;

  public Color2GrayFilter () {
    canFilterIndexColorModel = true; 
  }
  public int filterRGB (int x, int y, int rgb) {
    red   = (rgb & 0xff0000) >>16;
    green = (rgb &   0xff00) >>8;
    blue  = (rgb &     0xff);
    red =red*A/100;green = green*B/100; blue = blue*C/100;
    return (0xff000000 | red <<16| green << 8|  blue); 
  } 
}  

public class x2pgm extends Frame{

    /**
     * @param args
     */
    Color2GrayFilter filter;
    String[] name, size;
    Image SrcImage, gray;
    int w, h, pw, ph;
    PixelGrabber grab;
    boolean debug = false;
    boolean header = true;

    public static void main(String[] args) {
        x2pgm Loader = new x2pgm(args);
    }

    public void writeString(String wort, OutputStream out){
        try{
        for(int i=0; i< wort.length(); i++)
            out.write((int)wort.charAt(i));
            out.write((int)'\n');
        }catch(Exception e){
            System.out.println("Cannot Write to File");
        }
    }
    public x2pgm(String[] args){
        // TODO Auto-generated method stub
        System.out.println("x2pgm  v 0.0.0.1");
        System.out.println("==================================================================");
        if(args.length < 2){
            System.out.println("Usage:");
            System.out.println("x2pgm <inputfile [.png|.gif|.bmp|.jpeg]> <output_file> [debug] [noheader]");

        }else{
            filter = new Color2GrayFilter ();
            name = args[0].split("\\.");
            String ext = "pgm";
            //size = args[2].split("x");

            int i = 0;
            try{
                if(args[2].equals("debug") || args[3].equals("debug")) debug = true;
                if(args[3].equals("noheader") || args[2].equals("noheader")) header = false;
            }catch(Exception e){}

            try{
                File IN;

                IN = new File( args[0] );
                SrcImage = ImageIO.read( IN );
                /*
                w = Integer.parseInt(size[0]);
                h = Integer.parseInt(size[1]);
                                           */
                ph = SrcImage.getHeight(this);
                pw = SrcImage.getWidth(this);

                gray = createImage (new FilteredImageSource (SrcImage.getSource(), filter));
                /*
                                          System.out.println("->Schreibe Bild als: "+size[0]+"/"+pw+"px ("+((float)w/(float)pw*100)+"%) x "+size[1]+"/"+ph+"px ("+((float)h/(float)ph*100)+"%)");
                */
                final int[] pixels = new int[pw * ph];
                grab = new PixelGrabber( SrcImage, 0, 0, pw, ph, pixels, 0, pw );
                try{
                  grab.grabPixels();
                }catch ( InterruptedException e ) {
                  System.err.println( "Error getting pixels" );
                }
                if(header == true)
                    ext = "pgm";
                else
                    ext = "raw";
                OutputStream out = new FileOutputStream(args[1]+"."+ext) ;
                if(header == true){
                    writeString("P5",out);
                    writeString(pw+" "+ph,out);
                    writeString("255",out);
                }
                for(i = 0; i < pixels.length; i++){
                    if(debug && i%pw == 0)
                    System.out.print("#");
                    out.write(pixels[i]);
                }
                out.flush();
                out.close();

            }
            catch(IOException e){
                System.out.println("Fehler: "+e.toString());
            }
            System.out.println("");
            System.out.println("->"+i+" Zeilen geschrieben !");
        }
        System.out.println("==================================================================");
        System.out.println("(c) Philipp Haussleiter 2006");
        System.out.println("Skalierung geht noch nicht :-)");
        System.out.println("==================================================================");
    }
}