One common feature in all the AAC’s attempts at creating visual interfaces for their textual resources is the existence of a dual interface of text and image. In offering users reliable access to the text repository, it has been regarded of utmost importance to put on display not only the digital texts as representations of correlates to alphabetical systems, but also as digital images, conserving a graphical representation of the texts and the respective printed text carriers.
Setting up a parallel set of graphical data raises a number of issues. It does not only
require sufficient storage but also resources to adequately process large amounts of
images. Processing of images may involve a number of intermediate steps such as colour
corrections, colour conversions and / or geometric transformations. In projects working
with large scale print originals image segmentations were necessary to create clippings
of a size manageable in tools to work on both texts and images.