image_downsize filter-hook . WP 2.5.0

Returning a truthy value from the filter will effectively short-circuit down-sizing the image, returning that value instead.

Usage

add_filter( 'image_downsize', 'filter_function_name_400', 10, 3 );
function filter_function_name_400( $downsize, $id, $size ){
	// filter...

	return $downsize;
}

$downsize(true|false|array)

Whether to short-circuit the image downsize.

$id(int)

Attachment ID for image.

$size(string|int[])

Requested image size. Can be any registered image size name, or an array of width and height values in pixels (in that order).

Where the hook is called

$out = apply_filters( 'image_downsize', false, $id, $size );

$downsize = apply_filters( 'image_downsize', false, $attachment->ID, $size );

Where in WP core the hook is used WordPress