Bug Report – Workaround

Using plugin version 1.0 with WordPress 3.5.2 was serving up corrupted images – I traced it to WordPress having erroneous things in the output buffer. Also the plugin didn’t change the status code to 200 (instead it was left at 404, not really a critical problem though).

Solution was to change the end of the dynimg_404_handler() function to look like this:

// serve the image this one time (next time the webserver will do it for us)
	header_remove();

	flush();
	ob_end_clean();

	status_header( '200' );
	header( 'Content-Type: '.$type );
	header( 'Content-Length: ' . filesize($resized) );

	readfile($resized);

	exit;

Also, WordPress now has the image_resize function listed as deprecated, so I updated that section as well:

if ( file_exists($basefile) ) {
	// we have the file, so call the wp function to actually resize the image
	//OLD function $resized = image_resize($basefile, $width, $height, $crop, $suffix);

	$editor = wp_get_image_editor( $basefile );
	$editor->set_quality( 90 );

	$resized = $editor->resize( $width, $height, $crop );
	if ( is_wp_error( $resized ) )
		return $resized;

	$dest_file = $editor->generate_filename( $suffix, null );
	$editor->save( $dest_file );
	$resized = $dest_file;

https://www.ads-software.com/extend/plugins/dynamic-image-resizer/