The idea is simple, I want to be able to upload a directory full of pictures and have a slideshow. I have a few groups of photos to share with the world and more and more I’m keen on the idea of coding it myself rather then use a service like flickr or Picasa.
The first step was to upload my photos. I created a directory ‘images’ and inside that directory I created ‘originals’ and ‘700w’. I then uploaded all my pictures to the originals directory.
I then created a script to automatically resize all the images in my directory.
<?php
//it can take a bit to resize a bunch of images..
//php will by default only run for 30 seconds
//this removes that limitation
set_time_limit(0);
//open our directory
if ($handle = opendir('images/originals')) {
//go through our directory filenames one by one
while (false !== ($file = readdir($handle))) {
//ignore our . and .. directories
if ($file != "." && $file != "..") {
//open our image
$image = imagecreatefromjpeg('images/originals/'."$file");
if ($image === false) { closedir($handle); die ('Unable to open image'); }
//get our original image dimensions
$owidth = imagesx($image);
$oheight = imagesy($image);
//our new dimensions, hardcoded for a 700 width
//second line adjusts the height to keep the same aspect ratio
$nwidth = 700;
$nheight = $newheight=($oheight/$owidth)*$nwidth;
//create a new blank image the right size
$tmpimg=imagecreatetruecolor($nwidth,$nheight);
//and resize/resample our original into it
imagecopyresampled($tmpimg,$image,0,0,0,0,$nwidth,$nheight,$owidth,$oheight);
//write to file
$filename = "images/700w/". $file;
imagejpeg($tmpimg,$filename);
//clean up
imagedestroy($image);
imagedestroy($tmpimg);
}
}
closedir($handle);
}
?>
I saved this as ‘resize.php’ and ran it with ‘php resize.php’. After about a minute my 700w directory was full of resized images, and I’m all set up for the slideshow I want.