Most common in this category is work with historic glass negatives, medium and large format negatives, and 24x36mm, but the area covers all different type of transparent film material.
Uniform illumination of the materials, with good color reproduction is mandatory, so that all color information may be retrieved during processing, which often takes place from negative to positive.
The conversion process is often relative and open to interpretation, as the base material for the original transparency material varies. Two different rolls of film may behave very differently, both in the physical characteristics of the original base material and in their subsequent chemical development.
Traditional scanner solutions work with fixed sizes, such as 24x36mm, 6x6 or 6x9, thus limiting the versatility of the equipment substantially. Medium format based solutions work with all sizes, determined only by the light box, which may indeed be very large. If needed, a larger image may be stitched together from several individual high quality captures, to yield extremely high-resolution captures.
There is a tremendous speed advantage in the instant medium format capture over scanning,which may speed up the process by a factor of 200 to 300 or more.
This type of work may be performed both by curators or trained photographers.