Submit handler for updating an image effect.
function image_effect_form_submit($form, &$form_state) {
form_state_values_clean($form_state);
$effect = $form_state['values'];
$style = $form_state['image_style'];
image_effect_save($style, $effect);
drupal_set_message(t('The image effect was successfully applied.'));
$form_state['redirect'] = 'admin/config/media/image-styles/edit/' . $style
->id();
}