image_default_style_revert in core/modules/image/image.module

Revert the changes made by users to a default image style.

image_effect_delete in core/modules/image/image.module

Delete an image effect.

image_effect_save in core/modules/image/image.module

Save an image effect.

image_style_delete in core/modules/image/image.module

Delete an image style.

image_style_save in core/modules/image/image.module

Save an image style.