hacker.org

Posted: **Sun Jan 29, 2012 2:13 pm**

i've solved it with javascript, too:

var s = document.getElementsByTagName('img')[1];
var w = s.width, h = s.height;

var canvas = document.createElement("canvas");
canvas.width = w;
canvas.height = h;

var ctx = canvas.getContext("2d");
ctx.drawImage(s, 0, 0);

var cw = w / 16;
var ch = h / 16;
var x, y;
var txt = '';

for (y = 0; y < ch; ++y) {
    var b = '';

    for (x = 0; x < cw; ++x) {
        data = ctx.getImageData(8 + (x * 16), 8 + (y * 16), 1, 1).data;

        if (data[0] == 230) {
            b += 1;
        } else {
            b += 0;
        }
    }

    txt += String.fromCharCode(parseInt(b, 2).toString(10));
}

console.log(txt);

Posted: **Wed Mar 07, 2012 2:17 pm**

this one took me a long time, because i thought of these old Punched Tape coded in baudot. It took a while until I figured out that it is just 8-Bit-ASCII....

coding was done in Python

Posted: **Tue Dec 11, 2012 10:45 am**

Hello, I thought I'll post a VB solution (feel free to laugh)

Code: Select all

    For y = 120 To Picture1.Height Step (16 * 15)
        b = 0
        p = 7
        For x = 120 To Picture1.Width - 120 Step (16 * 15)
            If (Picture1.Point(x, y) And &HFF) = 230 Then b = b Or (2 ^ p)
            p = p - 1
        Next x
        sstr = sstr & Chr(b)
    Next y
    Clipboard.Clear
    Clipboard.SetText sstr

You paste the picture into the box, and the answer goes in clipboard. For non-VB users, each pixel = 15 'twips'.

Posted: **Tue Apr 16, 2013 9:56 pm**

Used AutoIt as well:

$x = 32
$y = 340
$farbe = 0

$text = ""
While $farbe <> 1579032
$wert = 0

for $zahl = 0 to 7
$farbe = PixelGetColor($x + ($zahl * 16),$y)
if $farbe = 15132390 Then
$wert = $wert + 2^(7-$zahl)
EndIf
Next
ConsoleWrite(chr($wert))
$y = $y +16

WEnd
ConsoleWrite(@CRLF)

Posted: **Thu Feb 13, 2014 4:37 pm**

mjb wrote:I just solved it with a little PHP script:
Code: Select all
<?php
	$im = imagecreatefrompng('http://www.hacker.org/challenge/misc/stars.php');
?>

That's what I tried at first, but how did you manage to keep your hacker.org session going for that? I had to get the file's contents through fopen, just so I could send my Cookie: header along. :]

Posted: **Fri Feb 14, 2014 9:45 am**

See the bottom of this for automated submitting

Posted: **Thu Apr 10, 2014 5:58 pm**

For the hard work I have used irfan, rest was easy python.

Code: Select all

i_view32 stars.png /gray /bpp=1 /resize_short=8 /aspectratio /resample /convert=stars.bmp 
i_view32 stars.bmp /gray /invert /bpp=1 /convert=stars2.bmp

Posted: **Tue Aug 26, 2014 12:07 pm**

I saved the picture from the browser and used Perl and GD to do the real work.

Code: Select all

use GD::Image;

$filename="~/Downloads/images/stars.php.png";
my $image = GD::Image->newFromPng($filename);
my ($height, $width) = $image->getBounds;

for ($x=8;$x<=$width;$x=$x+16) {
    $summe=0;
    $z=7;
    for ($y=8;$y<=$height;$y=$y+16) {
        my ($index) = $image->getPixel($y,$x);
        my ($r,$g,$b) = $image->rgb($index);
        if ($r == 228) {
            $summe=$summe+2**$z;
        }
        $z--;
    }
    push @result,$summe;
}

print pack("C*", @result);
print "\n";

Posted: **Tue Jul 28, 2015 3:45 am**

Am I the only one that learned to quickly read and translate the images? I'm too lazy to write code when it's not needed, and it probably took less overall time than writing out a script

Posted: **Thu Jul 30, 2015 2:47 pm**

browni3141 wrote:Am I the only one that learned to quickly read and translate the images? I'm too lazy to write code when it's not needed, and it probably took less overall time than writing out a script

Wow, you have returned to the site ... 5 challenges solved recently ...

Posted: **Sat Aug 01, 2015 2:27 pm**

browni3141 wrote:Am I the only one that learned to quickly read and translate the images?

Yes

Posted: **Mon May 09, 2016 11:44 am**

I did it in Javascript, no problems, fun challenge

Code: Select all

var answer = "";
    var img = document.getElementsByTagName('img')[1];
    var canvas = document.createElement('canvas');
    canvas.width = img.width;
    canvas.height = img.height;
    canvas.getContext('2d').drawImage(img, 0, 0, img.width, img.height);;
    for(var i=0;i<(img.height/16);i++){
        curInt = ((16*i)+8)
        bit="";
        for(var x=0;x<8;x++){
            xInt = 8+(16*x)
            colour = canvas.getContext('2d').getImageData(xInt,curInt, 1, 1).data
            bit += (colour[0] == 223?0:1);
        }
        answer +=(String.fromCharCode(parseInt(bit,2).toString(10)))
    }

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