WordPress at a glance
filter is not described

image_make_intermediate_size filter-hook . WP 2.6.0

Filters the name of the saved image file.

Usage

add_filter( 'image_make_intermediate_size', 'filter_function_name_3440' );
function filter_function_name_3440( $filename ){
	// filter...

	return $filename;
}
$filename(string)
Name of the file.

Where the hook is called

WP_Image_Editor_GD::_save()
WP_Image_Editor_Imagick::_save()
wp-includes/class-wp-image-editor-gd.php 420
'file'      => wp_basename( apply_filters( 'image_make_intermediate_size', $filename ) ),
wp-includes/class-wp-image-editor-imagick.php 643
'file'      => wp_basename( apply_filters( 'image_make_intermediate_size', $filename ) ),

Where the hook is used (in WP core)

Does not used.