if ($creer) {
		$im = $image["fonction_imagecreatefrom"]($im);

		$im_ = imagecreatetruecolor($x_i, $y_i);
		@imagealphablending($im_, false);
		@imagesavealpha($im_,true);
		$color_t = ImageColorAllocateAlpha( $im_, 255, 255, 255 , 127 );
		imagefill ($im_, 0, 0, $color_t);

		for ($x = 0; $x < $x_i; $x++) {
			for ($y=0; $y < $y_i; $y++) {
			
				$rgb = ImageColorAt($im, $x, $y);
				$a = ($rgb >> 24) & 0xFF;
				$r = ($rgb >> 16) & 0xFF;
				$g = ($rgb >> 8) & 0xFF;
				$b = $rgb & 0xFF;
				
				$g = round(($r+$g+$b) / 3);
				
				if ($g >= $deb AND $g <= $fin) $color = ImageColorAllocateAlpha( $im_, $dr, $dv, $db , $a );
				else $color = ImageColorAllocateAlpha( $im_, 0, 0, 0 , 127 );
				
				imagesetpixel ($im_, $x, $y, $color);	
			}
		}		
		$image["fonction_image"]($im_, "$dest");		}