The Extend Image Module extends the Image module a little bit.
- Adds checkboxes for the fields of image editing forms by content type.
- Alt field required
- Title field required
The use of these additional checkboxes is configurable per content type.
Sets the Alt field maxlength value to 128 for editing forms of nodes.
This value is not configurable and is used on all types of content with an image Alt field.
How configure additional checkboxes
Please take a look at the documentation.