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Slide Scanning
Converting Your Film Photographs
to Digital
Presentation to UCHUG - 8/06/08
G. Skalka
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Why Scan?
• Film and prints degrade - bits do not
• Infinite identical copies of digital image
• Storage space is reduced
• Easier to edit and enhance digital photos
• Easier to view (with computer vs. projector)
• Easier to share
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Film Photography
• Color photographic film contains three
emulsion layers
–Each contains silver salts that are sensitive to a
particular frequency range (color) of light
–Blue, Red and Green are recorded separately
–Colored dyes replace the silver salts in the film
during developing, forming color images
• The dyes break down over time, accelerated
by heat and light
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Film Types
• Negative Film
–Produces color negatives, from which color
prints are made
–Most cost-effective film type when prints are
needed
• Reversal Film
–Produces color transparencies (slides)
–Less expensive to use than negative or print
film (unless prints are needed)
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Film Size
• 35 mm (also called 135) was and is the most
popular type of roll film
• 35 mm wide film strip
–Image size is 36 mm x 24 mm
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Digital Photography
• Images are recorded in pixels, the smallest
piece of information in the image
• Digital cameras use an image sensor to
convert the visual image directly to digital
bits
–Sensors consist of a large number of single
sensor elements, in an array
• Scanners use image sensors to convert the
image recorded on film to digital
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Resolution
• Rendering an optical view (in a digital
camera) or image (in a scanner) with more
pixels (higher resolution) results in a more
accurate representation
• Digital Camera Resolution
–Measured in pixels (or typically megapixels)
–3072 x 2304 pixels provides 7.1 megapixels
Resolution
• Scanner Resolution
–Measured in dpi (dots per inch), or more
accurately, ppi (pixels per inch) or spi (samples
per inch)
• Film Resolution
–Measured in lines, the number of adjacent lines
(paired as one light and one dark) that can be
resolved).  Photographic film has 3000 - 6000
lines per inch.
Resolution
• Print Resolution
–Measured in dpi
–Typical resolution for photographic print paper
is 300 dpi
Should You Scan Prints or Film?
• Film is original - Print is second generation
copy
• Film is higher resolution (10x, 3000 dpi
min. vs. 300 dpi)
–At 300 dpi, the equivalent full-resolution print
from 35 mm film would be 14” x 9.4”
–Only scanning a large print yields a better
digital image (assumes scanners can take
advantage of full resolution in each case)
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