Re: [PHP] Re: Trying to create a colortable - what am I missing here?

[Thodoris]

On Tue, 2009-05-12 at 18:05 +0300, Thodoris wrote:
  
Still curious about the right script though (if this is possible of
course).
    

Of course it's possible... but you're probably not going to get the
results you want since you're taking 3 dimensions and trying to push
them into 2. You'll notice most colour pickers have a square for a given
colour, and a bar to pick the colour. The following will produce a
colour picker, but it won't look like what you expect:

<?php

$width = $height = 500;

$im = imagecreatetruecolor( $width, $height );

$root = pow( $width * $height, 1/3 );

$x = $y =  0;
for( $r = 0; $r < $root; $r++ )
{
    $rv = (int)(256 * ($r / $root));

    for( $g = 0; $g < $root; $g++ )
    {
        $gv = (int)(256 * ($g / $root));

        for( $b = 0; $b < $root; $b++ )
        {
            $bv = (int)(256 * ($b / $root));

            $n = imagecolorallocate( $im, $rv, $gv, $bv );
            imagesetpixel( $im, $x, $y, $n );
    
            if( ++$x >= $width )
            {
                $x = 0;
                $y++;
            }
        }
    }
}

header( "Content-Type: image/png" );
imagepng( $im );
imagedestroy( $im );

?>

Cheers,
Rob.
  

Thanks for pointing to the right direction Rob. I should really consider 
some reading on image manipulation theory.

My curiosity still beats my reading though.

--
Thodoris