In article ,
tony cooper wrote:
I see nothing wrong with asking for the best way. That’s taken to mean the easiest, the fastest, and the method that produces the best results. Sometimes those are conflicting goals, and sometimes the cost is a factor.
Dedicated slide and negative scanners are probably the best way, and flatbeds with slide and negative scanning accessories are probably the next best.
Actually, drum scanners are the best way. Dedicated film scanners are a distant second; consumer-grade flatbed scanners with transparency adapter gizmos just plain suck. 🙂
Drum scanners work by mounting the negative or transparency on a clear glass cylinder. The cylinder is spun at high speed, and a tiny, very powerful light moves down the center of the cylinder. Light shines through the spinning drum and is detected by a photomultiplier tube which passes over the outside surface of the drum.
Photomultiplier tubes are exquisitely sensitive; they can detect even a single photon of light. Drum scanners can easily record very fine, very subtle detail even in shadows.
Film scanners and flatbed scanners use charge-coupled devices (CCDs), not photomultiplier tubes. CCDs, which are the same light-sensing gizmos found in digital cameras, tend not to be as sensitive to light as PMTs. As a result, they have difficulty picking up subtle shadow detail, especially in dark negatives or underexposed transparencies. Even high-end, $45,000 flatbed scanners do not reproduce the same tonal range as a drum scanner, advertising hype of high-end flatbed vendors aside.
If you take a scan made by a very good film scanner and you compare it to a scan made by a drum scanner, the difference can be quite dramatic. The overall tonal range and the detail in the hilights and shadows of the scan made by the drum scanner is much, much better. Film scanners, especially cheap consumer-quality film scanners, tend to produce scans that are flat and muddy in the shadows.
Of course "best" tends to mean "money is no object." Drum scanners are the best scanners, period, but they’re also very, very pricey.
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