Can somebody explain to me how I can capture an image from a processing application with more than 300 dpi's? What I need to do is capture an image that will print out at a very large size. I could maybe do it using the PDF library but I have not been able to get it to work. I'm very new at this and if somebody could give me a hand, i'd really appreciate it:

Here's the code I've been messing with

/**
Click and/or drag to spawn life<br>
Press 'r' to fill randomly<br>
Press 'z' to decrease spawn rate (die out faster overall)<br>
Press 'x' to increase spawn rate (die out slower overall)<br>
Press space to clear<br>
*/

NotLifeCA ca;
Palette pal;
float spawnRate = 0.25;

void setup() {
 size(900,900, P3D);
 ca = new NotLifeCA();
 pal = new Palette("pat.gif");
 background(#ffffff);
loadPixels();
}

void draw() {
  if (mousePressed && mouseButton==LEFT) {
   ca.spawn(mouseX/2,mouseY/2);
 }
 ca.move();
 ca.draw(pal);
}

void keyPressed() {
 if (key=='`') saveFrame("frame.tga");
 if (key==' ') { ca.wipe(); background(#ffffff); }
 if (key=='r') { ca.create(); background(#ffffff); }
 if (key=='z') { if (spawnRate > 0.20) spawnRate -= 0.01; }
 if (key=='x') { if (spawnRate < 0.30) spawnRate += 0.01; }
}

class Palette {
 color [] colors;
 Palette(String filename) {
   colors = new color[256];
   PImage img = loadImage(filename);
   for (int i=0; i<256; i++)
     colors[i] = img.pixels[i];
 }
 color getColor() {
   return getColor((int)(random(256)));
 }
 color getColor(int i) {
   if (i<0) i=0;
   else if (i>255) i=255;
   return colors[i];
 }
}

class NotLifeCA {
 static final int maxlife = 63;
 int cols, rows;
 int [][] cells;
 NotLifeCA() {
   cols = width/2;
   rows = height/2;
   cells = new int[rows][cols];
   wipe();
 }
 void wipe() {
   for (int r=0; r<rows; r++)
     for (int c=0; c<cols; c++)
       cells[r][c] = 0;
 }
 void create() {
   for (int r=0; r<rows; r++)
     for (int c=0; c<cols; c++)
       cells[r][c] = (random(1.0)<0.999) ? 0 : maxlife;
 }
 void spawn(int c, int r) {
   if ((c>=0) && (c<cols) && (r>=0) && (r<rows))
     cells[r][c] = maxlife;
 }
 void move() {
   for (int r=0; r<rows; r++) {
     for (int c=0; c<cols; c++) {
       int cell = cells[r][c]--;
       if (cell==maxlife-1) {
         for (int rr=-1; rr<2; rr++) {
           int rrr = r + rr;
           if (rrr<0) rrr += rows;
           else if (rrr>=rows) rrr-=rows;
           for (int cc=-1; cc<2; cc++) {
             int ccc = c + cc;
             if (ccc<0) ccc += cols;
             else if (ccc>=cols) ccc -= cols;
             if (random(1.0) < spawnRate) {
               if (cells[rrr][ccc] < 0) {
                 cells[rrr][ccc] = maxlife;
               }
             }
           }
         }
       }
     }
   }
 }
 void draw(Palette pal) {
   int index = 0;
   for (int r=0; r<rows; r++) {
     for (int c=0; c<cols; c++) {
       int cell = cells[r][c];
       if (cell >= 0) {
         pixels[index] = pal.colors[cell<<2];
                }
       index+=2;
     }
     index += width;
   }
 updatePixels();
 }
}