A system to process graphical elements within a book during assessment of the book for suitability for conversion to an audio format includes an image classification subsystem, an image processing subsystem, and a weighting subsystem. The image classification subsystem is configured to classify a graphical element based on at least one of a context of the graphical element and properties of the graphical element. The image processing subsystem is configured process the graphical element to create a processed graphical element, the processing responsive to the classification of the graphical element. The weighting subsystem is configured to produce a weighting corresponding to the processed graphical element, the weighting indicating an impact of the graphical element of suitability of the book for conversion to the audio format.