Documents whether created or scanned into digital format can be edited to include labeling & highlighting.

Photographs can be superimposed over each other to illustrate similarities or changes over time. This can work extremely well when Patent issues are debated.

Once your document is in the digital format, it can be manipulated to include a multitude of editing practices, brightness, contrast, enlargements, text highlighting and or color-coding just to name a few, emphasizing a particular point you want to make.

Videotape images can be captured into digital format where the same principles can be applied.