[PHP] problem with imagecolorsforindex()

[Subbie Mitsman]

Hello,

I have this code in a php script, which takes all pixels from a PNG image
and produces a second "image"
with random numbers in HTML format this time. (an example can be found at
http://www.cyprusnews.org/sub/prog2.php).

Instead of getting ALL shades of red from the pallette, I get only 8-9
shades: those corresponding to
values of red with R value 0,51,102,153,204,255.

Anyone can explain that?

Here's the code:

$im = imagecreatefrompng("vac3.png");
$dimx = imagesx($im);
$dimy = imagesy($im);

for ($f=0; $f<$dimy; $f+=5) {
        for ($i=0; $i<$dimx; $i+=5) {
                $colsat = imagecolorat($im,$i,$f);
                $colss = imagecolorsforindex($im,$colsat);
                $r = dechex($colss[red]);
                $g = dechex($colss[green]);
                $b = dechex($colss[blue]);
                if ($colss[red] < 16)   $r = "0" . $r;  // assure that 13 becomes #0D 
and
not D
                if ($colss[green] < 16) $g = "0" . $g;
                if ($colss[blue] < 16)  $b = "0" . $b;
                $rndn = rand(0,9);
                echo "<font color=#".$r.$g.$b.">".$rndn."0";
        }
        echo "<br>";
}
ImageDestroy($im);


thanks

subbie


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