node API hook that can be used to alter fields before loaded by Views?
There are multiple ways in which this could be achieved:


Override the field itself in your theme with template_preprocess_field().
If the customization is more towards the markup, you can directly achieve that by overriding the field template.
Or you could just write a field formatter for this field, and select it in the field settings of the views and the view-mode (manage display) of your content type.