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LIGHTING
Simply
put, light is everything. Even the best camera or scanner
will not produce optimum results without adequate lighting.
Lighting for reprographics is especially critical:
-
it
must be as evenly distributed across the surface as possible;
-
it
must hold color temperature consistently;
-
it must provide enough illumination to be able to set optimal exposures;
-
it
should not pose a danger to artwork or operator with excessive
emissions of UV or IR and,
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it should be cost effective to maintain.
There
are 4 basic types of lighting currently in use in image capture:
Fluorescents, HMI, HID/CMD, and Tungsten. They differ in terms
of the amount of light they throw off, color temperature choice,
degree of heat emitted, UV emitted, and cost of running and
replacement. The following table provides an overview:
| TYPE |
HEAT |
UV |
TEMPS |
COST |
CHARACTERISTICS |
| FLUORESCENT |
LOW |
HIGH
UNLESS FILTERED
|
3.2K, 5.2k |
HIGH |
SMOOTH EVEN DIFFUSE LIGHT.
BUT REQUIRES VERY LARGE FIXTURES TO PRODUCE ENOUGH LIGHT
FOR GOOD EXPOSURES |
| HID |
LOW |
LOW |
3.4K,5.6K |
LOW |
SMOOTH EVEN LIGHT AT LOW
WATTAGE. LIGHT IS FOCUSABLE, LAMPS LAST 10-15,000 HRS.,
LOW ELECTRICAL DEMAND |
| TUNGSTEN |
HIGH |
MODERATE |
3.2K |
HIGH |
VERY HOT LIGHTS, LOW RATIO
OF IR TO ACTUAL LIGHT, SHORT BULB LIFE, HIGH ELECTRICAL
DEMAND |
| HMI |
HIGH |
LOW |
5k |
HIGH |
PURE SUNLIGHT. HIGH ELECTRICAL
DEMAND AND HIGH BULB REPLACEMENT COSTS. |
FOR MORE INFORMATION ABOUT LIGHTING:
http://www.betterlight.com/pdf/whitePaper/wp_museum_lighting.pdf
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Academic
Imaging Associates
P.O.
Box 192, 172 Carlen Street
Manchester Center, VT 05255
V 802.362.3169 F 802.362.0760
Academic Imaging Associates
Manufacturers of Technology, Lighting and Devices
of Interest to Digital Libraries,
Archives, and Scientific Institutions
BetterLight, Jenoptik, Metis, TTI Tarsia Technical Industries, AIAXact, Creo, Sinar, Kaiser, Linhof, Rollei, Schneider, Rodenstock, Imacon, PhaseOne, Nikon, Fuji, Microptics, Zig-Align, Kodak, Leaf, Cruse, Bogan, Bessler, Bassant, Zeiss, Sony, JVC, Braun, Kigamo, Kirtas, I2S D-Line, I2S Digibook, BookEye, Bhul, North Light, Dessanti, nNovia, Novoflex, Bogan, Panoscan, Canon, Comprehensive, ProVideo, Panasonic, Cambo, Epson, Contax, Colortrack, Eldim, Pixera, Riser, Hasselblad, Mamiya, Image Access
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