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| <?php | |
| $url = 'horse-meat.jpg'; | |
| /** | |
| * Turn an image into a mosaic | |
| * @param string $url Path to the image | |
| * @param int $sharpness Sample every x pixels. The td outputs will be x pixels high and wide | |
| * @param boolean $use_rgba Use rgba instead of hex (probably won't work for a lot of email providers) | |
| * @return string The table that will replicate the image | |
| */ | |
| function mosaic($url, $sharpness = 5, $use_rgba = false) { | |
| list($w, $h, $type) = getimagesize($url); | |
| $resource = imagecreatefromstring(file_get_contents($url)); | |
| //create the image the | |
| $img = '<table style="border-collapse: collapse; height:' . $h . 'px; width:' . $w . 'px; ">'; | |
| for ($y = 0; $y < $h; $y+=$sharpness) { | |
| $img .= '<tr>'; | |
| for ($x = 0; $x < $w; $x+=$sharpness) { | |
| $color = imagecolorat($resource, $x, $y); | |
| //get an rgba colour | |
| $rgba = imagecolorsforindex($resource, $color); | |
| $rgba['alpha'] = 1 - $rgba['alpha']; | |
| $colour_string = $use_rgba? 'rgba('.implode(',',$rgba).')':rgb2hex($rgba); | |
| $img .= '<td style="background:' . $colour_string . ';"></td>'; | |
| } | |
| $img .= '</tr>'; | |
| } | |
| $img .= '</table>'; | |
| return $img; | |
| } | |
| /** | |
| * Convert an rgb array to a hex string | |
| * @param array $rgba Format array('red'=>N1, 'green'=>N2, 'blue'=>N3, 'alpha'=>N4); | |
| * @return type | |
| */ | |
| function rgb2hex(array $rgb) { | |
| if(isset($rgb['alpha'])){ | |
| unset($rgb['alpha']); | |
| } | |
| $out = ""; | |
| foreach ($rgb as $c) { | |
| $hex = base_convert($c, 10, 16); | |
| $out .= ($c < 16) ? ("0" . $hex) : $hex; | |
| } | |
| return '#'.strtoupper($out); | |
| } | |
| ?> | |
| <style> | |
| td{ | |
| padding:0; | |
| overflow:hidden; | |
| } | |
| </style> | |
| <?php | |
| echo mosaic($url); |
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See here: http://blog.seanja.com/2013/02/sending-unblocked-images-email/