Moore, D. M. & Sasse, E. B. (1971). Effect of size and type of still projected pictures on immediate recall of content. AV Communication Review, 19(4), 437-450.

(Summary and conclusions.) Data showed:

1. The size of the picture presented made a significant difference in the amount of the subjects' immediate recall of content from pictures. (...)
2. The type of picture presented made a statistically significant difference in the amount of the subjects' immediate recall of content from pictures. (...)
3. The grade level of the subjects appeared to make a statistically significant difference in the amount of the subjects' immediate recall of content from pictures viewed. (...)
4. Overall, line drawings on a medium size format seemed to have been the most effective combination for testing immediate recall of content from a projected image using multiple choice questions. However, this was not the case at the seventh grade level, where the line drawings and large picture size seemed to be the most effective combination for visual presentation. At the third grade level, the paintings and medium picture size had the highest mean scores.