imagemagick - downsize/crop/save to jpeg in one go? - php

Question

I have a php script that will receive a bunch of images uploaded.
What I need to do is create a small thumbnail of each, on the fly using imagemagick.
I can do that easy enough but I also need to crop it so that the thumbnail is always 100x100.
the images supplied won't be the same proportions so simply downsizing won't work.
Can I downsize, crop to 100x100 and save to jpeg all in one step?

Answer 1

I believe this should do what you want:
convert 'just_uploaded/*' -resize 100x100^ -gravity center -extent 100x100 -set filename:f '%t' +adjoin 'just_uploaded_thumbs/%[filename:f].jpg'
resize will downsize, extent (in combination with gravity) will crop, and the rest takes care of saving with a modified name, in JPEG format, in a different directory.

Answer 2

Short answer: no. That'll be 3 steps, no less.
Longer answer: you can do it using the command line interface. In PHP, the only way is to write a function that will do what you ask. Then, for each image, you can just call your function. I'm not sure how this is more beneficial than just using the 3 Imagick functions separately...

Answer 3

I like the sfThumbnailPlugin. It wraps around both ImageMagick or GD
http://www.symfony-project.org/plugins/sfThumbnailPlugin
Example:
public function executeUpload()
{
// Retrieve the name of the uploaded file
$fileName = $this->getRequest()->getFileName('file');
// Create the thumbnail
$thumbnail = new sfThumbnail(150, 150);
$thumbnail->loadFile($this->getRequest()->getFilePath('file'));
$thumbnail->save(sfConfig::get('sf_upload_dir').'/thumbnail/'.$fileName, 'image/png');
// Move the uploaded file to the 'uploads' directory
$this->getRequest()->moveFile('file', sfConfig::get('sf_upload_dir').'/'.$fileName);
// Do whatever is next
$this->redirect('media/show?filename='.$fileName);
}