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Given either a full local path to a file, or a full URL to a file on your site, Just Resize will resize that image and return a cached URL:

<img src="{exp:just:resize src='{file1:path}' 
            width='400'}" />

That’s it.

This works with a few required configuration settings in your config.php to make things simple and obvious:

$config['just_resize_output_subdir'] = '_thumbs';
$config['just_resize_default_file'] = '/var/www/docs/public/assets/images/default.png';
$config['just_resize_fallback_url'] = 'http://example.com/assets/images/fallback.png';
$config['just_resize_server_path'] = '/var/www/docs/public/';
$config['just_resize_server_url'] = 'http://example.com/';
$config['just_resize_scream'] = false;

Finally, here is an example of the very detailed debug output provided by the plugin:

Tag: {exp:just:resize src=’/var/www/docs/public/uploads/images/arrakeen11080p_533189.jpg’ width=‘400’}

Just Resize: output_subdir -> _thumbs
Just Resize: default -> /var/www/docs/public/assets/images/default.png
Just Resize: fallback -> http://example.com/assets/images/default.png
Just Resize: server_path -> /var/www/docs/public/
Just Resize: server_url -> http://example.com/
Just Resize: src -> /var/www/docs/public/uploads/images/arrakeen11080p_533189.jpg
(0.256179 / 30.38MB) Just Resize: Final input source -> /var/www/docs/public/uploads/images/arrakeen11080p_533189.jpg
Just Resize: Source width -> 1920
Just Resize: Source height -> 1080
Just Resize: Calcualted target height from provided width -> Array ( [p_width] => 400 [height] => 225 )
Just Resize: Target width -> 400
Just Resize: Target height -> 225
Just Resize: Final output target -> /var/www/docs/public/uploads/images/_thumbs/arrakeen11080p_533189-400x225.jpg
Just Resize: Result URL -> http://example.com/uploads/images/_thumbs/arrakeen11080p_533189-400x225.jpg