Java, 1574 2643 1934 characters
Compressed 1574 characters:
public static void main(String[] args){int[][][]num={{{1,1,1},{1,0,1},{1,0,1},{1,0,1},{1,1,1}},{{0,0,1},{0,0,1},{0,0,1},{0,0,1},{0,0,1}},{{1,1,1},{0,0,1},{1,1,1},{1,0,0},{1,1,1}},{{1,1,1},{0,0,1},{1,1,1},{0,0,1},{1,1,1}},{{1,0,1},{1,0,1},{1,1,1},{0,0,1},{0,0,1}},{{1,1,1},{1,0,0},{1,1,1},{0,0,1},{1,1,1}},{{1,1,1},{1,0,0},{1,1,1},{1,0,1},{1,1,1}},{{1,1,1},{0,0,1},{0,0,1},{0,0,1},{0,0,1}},{{1,1,1},{1,0,1},{1,1,1},{1,0,1},{1,1,1}},{{1,1,1},{1,0,1},{1,1,1},{0,0,1},{0,0,1}},{{0,0,0},{0,0,0},{0,0,0},{0,0,0},{0,0,1}}};BufferedImage image=new BufferedImage(103,5,BufferedImage.TYPE_3BYTE_BGR);for(int q=0;q<103;q++){for(int w=0;w<5;w++){image.setRGB(q,w,0xFFFFFF);}}int loc = 0;String g=String.valueOf(pi(20));for(int w=0;w<g.length()-1;w++){Integer n=0;if(g.charAt(w)=='.'){n=10;}else{n=Integer.parseInt(String.valueOf(g.charAt(w)));}for(int t=0;t<5;t++){for(int q=0;q<3;q++){int c=num[n][t][q]==1?0x000000:0xFFFFFF;image.setRGB(loc+q,t,c);}}loc+=5;}try{BufferedImage bi=image;File f=new File("o.png");ImageIO.write(bi,"png",f);}catch(IOException e){}}public static BigDecimal pi(final int SCALE){BigDecimal a=BigDecimal.ONE;BigDecimal b=BigDecimal.ONE.divide(sqrt(new BigDecimal(2),SCALE),SCALE,BigDecimal.ROUND_HALF_UP);BigDecimal t=new BigDecimal(0.25);BigDecimal x=BigDecimal.ONE;BigDecimal y;while(!a.equals(b)){y=a;a=a.add(b).divide(new BigDecimal(2),SCALE,BigDecimal.ROUND_HALF_UP);b=sqrt(b.multiply(y),SCALE);t=t.subtract(x.multiply(y.subtract(a).multiply(y.subtract(a))));x=x.multiply(new BigDecimal(2));}return a.add(b).multiply(a.add(b)).divide(t.multiply(new BigDecimal(4)),SCALE,BigDecimal.ROUND_HALF_UP);}public static BigDecimal sqrt(BigDecimal A,final int SCALE){BigDecimal x0=new BigDecimal("0");BigDecimal x1=new BigDecimal(Math.sqrt(A.doubleValue()));while(!x0.equals(x1)){x0=x1;x1=A.divide(x0,SCALE,BigDecimal.ROUND_HALF_UP);x1=x1.add(x0);x1=x1.divide(new BigDecimal(2),SCALE,BigDecimal.ROUND_HALF_UP);}return x1;}} Expanded 2643 characters:
public static void main(String[] args) { int[][][] num = { { { 1, 1, 1 }, { 1, 0, 1 }, { 1, 0, 1 }, { 1, 0, 1 }, { 1, 1, 1 } }, { { 0, 0, 1 }, { 0, 0, 1 }, { 0, 0, 1 }, { 0, 0, 1 }, { 0, 0, 1 } }, { { 1, 1, 1 }, { 0, 0, 1 }, { 1, 1, 1 }, { 1, 0, 0 }, { 1, 1, 1 } }, { { 1, 1, 1 }, { 0, 0, 1 }, { 1, 1, 1 }, { 0, 0, 1 }, { 1, 1, 1 } }, { { 1, 0, 1 }, { 1, 0, 1 }, { 1, 1, 1 }, { 0, 0, 1 }, { 0, 0, 1 } }, { { 1, 1, 1 }, { 1, 0, 0 }, { 1, 1, 1 }, { 0, 0, 1 }, { 1, 1, 1 } }, { { 1, 1, 1 }, { 1, 0, 0 }, { 1, 1, 1 }, { 1, 0, 1 }, { 1, 1, 1 } }, { { 1, 1, 1 }, { 0, 0, 1 }, { 0, 0, 1 }, { 0, 0, 1 }, { 0, 0, 1 } }, { { 1, 1, 1 }, { 1, 0, 1 }, { 1, 1, 1 }, { 1, 0, 1 }, { 1, 1, 1 } }, { { 1, 1, 1 }, { 1, 0, 1 }, { 1, 1, 1 }, { 0, 0, 1 }, { 0, 0, 1 } }, { { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 1 } } }; BufferedImage image = new BufferedImage(103, 5, BufferedImage.TYPE_3BYTE_BGR); for (int q = 0; q < 103; q++) { for (int w = 0; w < 5; w++) { image.setRGB(q, w, 0xFFFFFF); } } int loc = 0; String g = String.valueOf(pi(20)); for (int w = 0; w < g.length()-1; w++) { Integer n = 0; if (g.charAt(w) == '.') { n = 10; } else { n = Integer.parseInt(String.valueOf(g.charAt(w))); } for (int t = 0; t < 5; t++) { for (int q = 0; q < 3; q++) { int c = num[n][t][q] == 1 ? 0x000000 : 0xFFFFFF; image.setRGB(loc + q, t, c); } } loc += 5; } try { BufferedImage bi = image; File outputfile = new File("out2.png"); ImageIO.write(bi, "png", outputfile); } catch (IOException e) { } } public static BigDecimal pi(final int SCALE) { BigDecimal a = BigDecimal.ONE; BigDecimal b = BigDecimal.ONE.divide(sqrt(new BigDecimal(2), SCALE), SCALE, BigDecimal.ROUND_HALF_UP); BigDecimal t = new BigDecimal(0.25); BigDecimal x = BigDecimal.ONE; BigDecimal y; while (!a.equals(b)) { y = a; a = a.add(b).divide(new BigDecimal(2), SCALE, BigDecimal.ROUND_HALF_UP); b = sqrt(b.multiply(y), SCALE); t = t.subtract(x.multiply(y.subtract(a).multiply(y.subtract(a)))); x = x.multiply(new BigDecimal(2)); } return a.add(b).multiply(a.add(b)).divide(t.multiply(new BigDecimal(4)), SCALE, BigDecimal.ROUND_HALF_UP); } public static BigDecimal sqrt(BigDecimal A, final int SCALE) { BigDecimal x0 = new BigDecimal("0"); BigDecimal x1 = new BigDecimal(Math.sqrt(A.doubleValue())); while (!x0.equals(x1)) { x0 = x1; x1 = A.divide(x0, SCALE, BigDecimal.ROUND_HALF_UP); x1 = x1.add(x0); x1 = x1.divide(new BigDecimal(2), SCALE, BigDecimal.ROUND_HALF_UP); } return x1; } Pi method gathered from: http://stackoverflow.com/questions/8343977/calculate-pi-on-an-android-phone?rq=1