memo.xight.org

function emboss($pic1,$patt) {
	header("Content-type: image/png");
	
	$source=imagecreatefromjpeg($pic1);    // Source
	$pattern=imagecreatefromjpeg($patt);    // pattern
	list($width, $height) = getimagesize($pic1);
	list($widthpatt, $heightpatt) = getimagesize($patt);
	$new_width=$width;
	$new_height=$width/$widthpatt*$heightpatt;
	if($new_height>$height){
		$offset=intval(($new_height-$height)/2);
	}
	elseif($new_height<$height){
		$offset=intval(($new_height-$height)/2);
	}
	else{
		$offset=0;
	}
	
	$image_p = imagecreatetruecolor($new_width, $new_height);
	$pattern = imagecreatefromjpeg($patt);
	imagecopyresampled($image_p, $pattern, 0, 0, 0, 0, $new_width, $new_height, $widthpatt, $heightpatt);
	
	$im = imagecreatetruecolor($width, $height);   
	
	for($y=0; $y < $height; $y++) {
		for($x=0; $x < $width; $x++) {
			$colors=imagecolorsforindex($source, imagecolorat($source, $x,$y));
			$pattern_color=imagecolorsforindex($image_p, imagecolorat($image_p, $x,($y+$offset)));
			//changes brightness depending on luminance
			if(($y+$offset+1)>0 &&($y+$offset)<($new_height-1)){
				$brightness=abs(($pattern_color['red']*50/255)-50);
				if($pattern_color['red']<150){
					$change=true;}
				else{
					$change=false;
					$tally=0;
				}
				if($change&&$tally<2){
					$highlight=1.8;
					$tally++;
				}
				else{
					$highlight=1;
				}
				$brightness = $brightness * $highlight;
			}
			else{
				$brightness=0;
			}
			$r=(($colors['red']+$brightness)>255)? 255 : ($colors['red']+$brightness);
			$g=(($colors['green']+$brightness)>255)? 255 : ($colors['green']+$brightness);
			$b=(($colors['blue']+$brightness)>255)? 255 : ($colors['blue']+$brightness);
			
			$test=imagecolorallocate($im, $r,$g,$b);
			imagesetpixel($im,$x, $y, $test);
		}
	}
	imagepng($im);
	imagedestroy($im);
}
emboss("me.jpg","patternsq.jpg");
//emboss("magic800.jpg","patternsq.jpg");
//emboss("crop.jpg","patternsq.jpg");

<img src="emboss.php" />