Reading Images. The Grammar of Visual Design

Pictures, or image texts as a more scientifically term we can now use, are often thought of being worth a thousand words. They can be interpreted in many different ways by different people. As there are too many possible interpretation for a single picture then how can we come to justified and grounded meaning(s) of the picture? How can we understand the basic structure of an image text? There should be this underlying structure that people can rely on in their efforts to make meaningful and justified meaning(s) of image texts for there seems to be nothing, even in what people find abstract or absurd, which is without pattern, hence, structure.