<?php

header("Content-type: image/png");

$source = imagecreate(1, 255);

$start_color = ltrim(trim("#FFFFFF"), "#");
$end_color = ltrim(trim("#00FFFF"), "#");
		
$start_color = array("red" => base_convert(substr($start_color, 0, 2), 16, 10), "green" => base_convert(substr($start_color, 2, 2), 16, 10), "blue" => base_convert(substr($start_color, 4, 2), 16, 10));
$end_color = array("red" => base_convert(substr($end_color, 0, 2), 16, 10), "green" => base_convert(substr($end_color, 2, 2), 16, 10), "blue" => base_convert(substr($end_color, 4, 2), 16, 10));

for ($y = 0; $y < imagesy($source); $y++)
{
	if ($start_color['red'] < $end_color['red'])
		$start_color['red']++;
		
	if ($start_color['green'] < $end_color['green'])
		$start_color['green']++;
		
	if ($start_color['blue'] < $end_color['blue'])
		$start_color['blue']++;
	
	$color = imagecolorallocate($source, $start_color['red'], $start_color['green'], 						$start_color['blue']);
	imagesetpixel($source, 0, $y, $color);
}

imagepng($source);

?>