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If Scanning a Print Makes the
Most Sense
• Scan the largest print available
• Make sure the scanner glass is clean
• Scan at 300 dpi maximum
–At 300 dpi print resolution, no additional
information is available for higher resolution
scans
–Higher scanning resolution makes file size
unnecessarily large
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Film Scanning Options
• Two basic choices
–Flatbed scanner with transparency adapter
–Dedicated film scanner
• Third choice - use a scanning service
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Flatbed Scanners
• Require a transparency adapter to scan film
–An additional calibrated light source opposite
the film from the sensor
–Light from transparency adapter passes through
film to sensor
–Light must also pass through glass plate
• Resolutions of 4800 dpi to 9600 dpi
• $80 to $500
• Can also scan prints and documents
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Film Scanners
• Dedicated to slide / negative scanning
(typically 35 mm only)
• Generally higher image quality for film
• Resolutions up to 5400 dpi
• $100 to $5000
• Can include auto-feed for both mounted
slides and strip film
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Film Scanning Service
• You send in film - they digitize
• Can provide digital editing and optimization
• Can provide on CD, DVD or online
• $0.50 - $0.90 per slide or negative
• Many services available - probably many
results as well
• Ask about scan resolutions and file formats
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of compensation for limitations (other documents are compatible, including PDF, TIFF, MS on slide with no more plug-ins needed like Acrobat or Adobe reader.
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How Much Resolution is
Needed?
• 35 mm film is 3000 to 6000 dpi, or
equivalent to 12 to 48 megapixels
• To print from scan of film
–11” x 14” print requires minimum 3000 dpi
scan or 12 megapixel file
–8” x 10” print requires minimum 2400 dpi scan
or 7.7 megapixel file
–5” x 7” print requires minimum 1400 dpi scan
or 2.6 megapixel file
Digital Image File Formats
• PNG - Portable Network Graphics - .png
–Lossless compression - approx. 75% of TIFF
–Fairly well supported
• TIFF - Tag Image File Format - .tif
–Uncompressed; can have lossless compression
–Most universal commercial format
• JPEG - Joint Photographic Experts Group
–Lossy compression provides files 10% of TIFF
–Most popular for digital photo exchange
What File Format to Use?
• PNG or TIFF for archiving
• JPEG for displaying or sharing
• I recommend storing masters as PNG, and
converting to JPEG for use and display
–Not all my scanning software supports PNG, so
conversion from TIFF may be necessary
–I may need to look for better scanning software
My Four Film Scanners
• HP ScanJet 5370 Cxi Flatbed w/TMA
–1200 dpi (1.9 megapixel), $300 in 1998
• PrimeFilm 1800u Film Scanner
–1800 dpi (4.4 megapixel), $120 in 2003
• Microtek ScanMaker S400 Flatbed w/TMA
–4800 dpi (30.8 megapixel), $80 in 2006
• PrimeFilm 3600u Film Scanner
–3600 dpi (17.4 megapixel), $120 in 2008
HP ScanJet Cxi Flatbed
• 1200 dpi flatbed, scan time = 1 min
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