Remove whitespace from around image.

crop.php

<?php

  /* Crop images */
  /* Find whitespace around image and remove */

$border = 5;

/* Get image */
$orig = getImage($argv[1]);

/* */
$imagesize = getimagesize($argv[1]);
$width = $imagesize[0];
$height = $imagesize[1];
unset($imagesize);

/* Find whitespace around edge of $orig */
$x_min = getXMin($orig, $width, $height);
$x_max = getXMax($orig, $width, $height);

$y_min = getYmin($orig, $width, $height);
$y_max = getYmax($orig, $width, $height);

/* Create a new image */
$im = imagecreatetruecolor(($x_max - $x_min) + (2 * $border), ($y_max - $y_min) + (2 * $border));
$white = imagecolorallocate($im, 0xFF, 0xFF, 0xFF);
imagefill($im, 0, 0, $white);
/* Copy section of $orig */
imagecopy($im, $orig, 0, 0, ($x_min - $border), ($y_min - $border), (($x_max - $x_min) + $border), (($y_max - $y_min) + $border));

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

imagedestroy($orig);
imagedestroy($im);

exit(0);

function getXMin($im, $w, $h) {
	for($x=0;$x<$w;++$x) {
		for($y=0;$y<$h;++$y) {
			if(imagecolorat($im, $x, $y) != 0xFFFFFF) {
				return $x;
			}
		}
	}
}

function getYMin($im, $w, $h) {
	for($y=0;$y<$h;++$y) {
		for($x=0;$x<$w;++$x) {
			if(imagecolorat($im, $x, $y) != 0xFFFFFF) {
				return $y;
			}
		}
	}
}

function getXMax($im, $w, $h) {
	for($x=($w-1);$x>=0;--$x) {
		for($y=0;$y<$h;++$y) {
			if(imagecolorat($im, $x, $y) != 0xFFFFFF) {
				return $x;
			}
		}
	}
}

function getYMax($im, $w, $h) {
	for($y=($h-1);$y>=0;--$y) {
		for($x=0;$x<$w;++$x) {
			if(imagecolorat($im, $x, $y) != 0xFFFFFF) {
				return $y;
			}
		}
	}
}

function getImage($filename) {
	$type = exif_imagetype($filename);

	switch($type) {
		case IMAGETYPE_GIF:
			return imagecreatefromgif($filename);
			break;
		case IMAGETYPE_JPEG:
			return imagecreatefromjpeg($filename);
			break;
		case IMAGETYPE_PNG:
			return imagecreatefrompng($filename);
			break;
		case IMAGETYPE_BMP:
			return imagecreatefromwbmp($filename);
			break;
		default:
			print 'UNKNOWN IMAGE TYPE: ' . image_type_to_mime_type($type) . "\n";
			return FALSE;
			break;
	}

}