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Rolled
Film
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'Microfilm' is a generic word describing several types of photographic negatives, all of which is used for storing small images of pages, drawings etc. These, and all other types of film, can be scanned successfully. Rolled
film was predominantly used for page filming and older individual negatives
are usually used for drawings, plans and pictorial images. For text
and lineart, scanning at one bit depth is required with a resolution
of 200 ppi at the final image size. Black and white photographs require
scanning in greyscales normally at eight bit depth resulting in 256
shades of grey. Resolution for greyscale scanning is as for lineart
above. |
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There
are different sizes of rolled film, 8mm, 16mm, 35mm etc and these are
typically used for images of correspondence, manuals etc.
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©
2001 Hamilton Ltd - issue 30/10/01
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