ericandrewlewis/gist:7956116

## gistfile1.php
<html>
<head>
	<title></title>
</head>
<body>
	<?php
	/**
	 * Convert an RGB value to HSL.
	 *
	 * @param  int $r Red value.
	 * @param  int $g Green value.
	 * @param  int $b Blue value.
	 * @return array $hsl HSL value in order: hue, saturation, and luminosity.
	 */
	function rgbToHsl( $r, $g, $b ) {
		$oldR = $r;
		$oldG = $g;
		$oldB = $b;

		$r /= 255;
		$g /= 255;
		$b /= 255;

		$max = max( $r, $g, $b );
		$min = min( $r, $g, $b );

		$h;
		$s;
		$l = ( $max + $min ) / 2;
		$d = $max - $min;

		if( $d == 0 ){
			$h = $s = 0; // achromatic
		} else {
			$s = $d / ( 1 - abs( 2 * $l - 1 ) );

		switch( $max ) {
				case $r:
					$h = 60 * fmod( ( ( $g - $b ) / $d ), 6 );
						if ($b > $g) {
						$h += 360;
					}
					break;

				case $g:
					$h = 60 * ( ( $b - $r ) / $d + 2 );
					break;

				case $b:
					$h = 60 * ( ( $r - $g ) / $d + 4 );
					break;
			}
		}

		return array( round( $h, 2 ), round( $s, 2 ), round( $l, 2 ) );
	}


	function get_most_saturated_color_from_image( $path ) {
		$img = imagecreatefromjpeg( $path );
		$img_size = getimagesize( $path );
		$highest_saturation = 0;

		for( $row = 0; $row <= $img_size[1]; $row++ ) {
			for( $column = 0; $column <= $img_size[0]; $column++ ) {
				$rgb = imagecolorat( $img, $row, $column );
				$r = ( $rgb >> 16 ) & 0xFF;
				$g = ( $rgb >> 8 ) & 0xFF;
				$b = $rgb & 0xFF;
				$hsl = rgbToHsl( $r, $g, $b );
				if ( $hsl[1] > $highest_saturation ) {
					if ( $hsl[2] < .3 )
						continue;
					$pick = array( $r, $g, $b );
				}
			}
		}
		$hex = str_pad( dechex( $pick[0] ), 2, '0', STR_PAD_LEFT ) . str_pad( dechex( $pick[1] ), 2, '0', STR_PAD_LEFT ) . str_pad( dechex( $pick[2] ), 2, '0', STR_PAD_LEFT );
		return $hex;
	}

	// $files[] = dirname( __FILE__ ) . '/active.jpg';
	$files[] = dirname( __FILE__ ) . '/angkor-wat.jpg';
	// $files[] = dirname( __FILE__ ) . '/luxury.jpg';
	// $files[] = dirname( __FILE__ ) . '/scotland.jpg';

	foreach ( $files as $file ) {
		$hex = get_most_saturated_color_from_image( $file );
		?>
		<div style="height: 100%; width: 100%; background-color: #<?php echo $hex ?>;">
			<img src="<?php echo basename( $file ) ?>" /></div><?php
	}
?>
</body>
</html>
	<html>
	<head>
	<title></title>
	</head>
	<body>
	<?php
	/**
	* Convert an RGB value to HSL.
	*
	* @param int $r Red value.
	* @param int $g Green value.
	* @param int $b Blue value.
	* @return array $hsl HSL value in order: hue, saturation, and luminosity.
	*/
	function rgbToHsl( $r, $g, $b ) {
	$oldR = $r;
	$oldG = $g;
	$oldB = $b;

	$r /= 255;
	$g /= 255;
	$b /= 255;

	$max = max( $r, $g, $b );
	$min = min( $r, $g, $b );

	$h;
	$s;
	$l = ( $max + $min ) / 2;
	$d = $max - $min;

	if( $d == 0 ){
	$h = $s = 0; // achromatic
	} else {
	$s = $d / ( 1 - abs( 2 * $l - 1 ) );

	switch( $max ) {
	case $r:
	$h = 60 * fmod( ( ( $g - $b ) / $d ), 6 );
	if ($b > $g) {
	$h += 360;
	}
	break;

	case $g:
	$h = 60 * ( ( $b - $r ) / $d + 2 );
	break;

	case $b:
	$h = 60 * ( ( $r - $g ) / $d + 4 );
	break;
	}
	}

	return array( round( $h, 2 ), round( $s, 2 ), round( $l, 2 ) );
	}



	function get_most_saturated_color_from_image( $path ) {
	$img = imagecreatefromjpeg( $path );
	$img_size = getimagesize( $path );
	$highest_saturation = 0;

	for( $row = 0; $row <= $img_size[1]; $row++ ) {
	for( $column = 0; $column <= $img_size[0]; $column++ ) {
	$rgb = imagecolorat( $img, $row, $column );
	$r = ( $rgb >> 16 ) & 0xFF;
	$g = ( $rgb >> 8 ) & 0xFF;
	$b = $rgb & 0xFF;
	$hsl = rgbToHsl( $r, $g, $b );
	if ( $hsl[1] > $highest_saturation ) {
	if ( $hsl[2] < .3 )
	continue;
	$pick = array( $r, $g, $b );
	}
	}
	}
	$hex = str_pad( dechex( $pick[0] ), 2, '0', STR_PAD_LEFT ) . str_pad( dechex( $pick[1] ), 2, '0', STR_PAD_LEFT ) . str_pad( dechex( $pick[2] ), 2, '0', STR_PAD_LEFT );
	return $hex;
	}

	// $files[] = dirname( __FILE__ ) . '/active.jpg';
	$files[] = dirname( __FILE__ ) . '/angkor-wat.jpg';
	// $files[] = dirname( __FILE__ ) . '/luxury.jpg';
	// $files[] = dirname( __FILE__ ) . '/scotland.jpg';

	foreach ( $files as $file ) {
	$hex = get_most_saturated_color_from_image( $file );
	?>
	<div style="height: 100%; width: 100%; background-color: #<?php echo $hex ?>;">
	<img src="<?php echo basename( $file ) ?>" /></div><?php
	}
	?>
	</body>
	</html>