There are many ways of interpreting the things we see around us. This book gives a set of tools so that we can interpret visual artifacts through a specific methodology - hence the title.
Here's a list of the chapters directly relating to methodologies but it's not an exhaustive list of the book's chapters:
3. The Good Eye - looking at pictures using compositional analysis
4. Content analysis - counting what you (think you) see
5. Semiology - laying bare the prejudices beneath the smooth surface of the beautiful
6. Psychoanalysis - visual culture, visual pleasure, visual disruption
7. Discourse analysis1 - text, intertextuality, context
8. Discourse analysis 2 - institutions and ways of seeing
9. Audience studies - studying how television gets watched
10. An anthropological approach - directly observing the social life of visual objects
11. Making photographs as part of a research project - photo-elicitation, photo documentation an other uses of photos.
So it's a pretty broad selection and I'm sure you'll find something here that's relevant to your work. The text recommends that 2 or 3relevant methods are applied to whatever it is you're researching so you get a balanced view. The text is accessible and surprisingly easy reading for such a theory based subject. The book was of definite use for me in adding academic depth in my degree essays and of course helping me understand certain things.