GD Library - Print 2 Pictures on 1 Page

PHP Tutorials - Herong's Tutorial Examples

∟GD Library - Print 2 Pictures on 1 Page

This section provides a tutorial example on how to compose a print page with 2 pictures placed vertically using GD Library functions.

You can follow this tutorial to compose a print page with 2 pictures placed vertically using GD Library functions.

1. Here is the PHP script, GD-2-To-1-Page.php:

<?php
#  GD-2-To-1-Page.php
#- Copyright (c) HerongYang.com. All Rights Reserved.

$resolution = 300;
$margin = intval(0.5*$resolution);
$page_width = intval(8.5*$resolution);
$page_height = intval(11.0*$resolution);

if (count($argv)<3) {
  print("Usage: php GD-2-To-1-Page input1 input2.\n");
  exit;
}
$pic1 = imagecreatefrompng($argv[1]);
$pic2 = imagecreatefrompng($argv[2]);

$page = imagecreatetruecolor($page_width,$page_height);
$white = imagecolorallocate($page, 255,255,255);
imagefill($page, 0,0, $white);

$width = $page_width - 2*$margin;
$height = intval($page_height/2 - 1.5*$margin);
$center_x = intval($width/2) + $margin;
$center_y = intval($height/2) + $margin;
post_on_page($page, $pic1, $center_x, $center_y, $width, $height);

$width = $page_width - 2*$margin;
$height = intval($page_height/2 - 1.5*$margin);
$center_x = intval($width/2) + $margin;
$center_y = intval($height/2) + $margin + $height + $margin;
post_on_page($page, $pic2, $center_x, $center_y, $width, $height);

$file = "GD-Page.png";
imagepng($page, $file);
print("Page saved:\n");
print("   File: $file\n");

function post_on_page($page, $pic, $center_x, $center_y, $width, $height) {
  $w = imagesx($pic);
  $h = imagesy($pic);
  $ratio = min($width/$w,$height/$h);
  if ($ratio<1.0) {
    $w = intval($ratio*$w);
    $pic = imagescale($pic,$w);
    $h = imagesy($pic);
  }
  $off_x = $center_x - intval($w/2);
  $off_y = $center_y - intval($h/2);
  imagecopy($page,$pic, $off_x,$off_y, 0,0, $w,$h);

  $black = imagecolorallocate($page, 0,0,0);
  imagerectangle($page,$off_x-1,$off_y-1, $off_x+$w+1,$off_y+$h+1, $black);
}
?>

Run it with 2 sample pictures:

php GD-2-To-1-Page.php sample1.png sample2.png
Page saved:
   File: GD-Page.png

Note that the script is using a resolution of 300 DPI. Your picture should have more than 300*8=2400 pixel in one direction to fill the page. In other words, the camera should take about 2400*2400=5,760,000 or 6M pixels.