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Let s not waste a lot of time on this In fact, the only reason I m including it is in case some scanner sales guy tries to throw some jargon at you just to make you feel like you re at his mercy Once in a while, you ll see a reference to dynamic range among the specs for a scanner (or digital camera, for that matter) Here s what it is Dynamic range, or Dmax, is the ability of a scanner to accurately capture the lightest and darkest colors or gray shades in an image If a photo has both bright sunlight and dark shadows, such as the scene in Figure 2-4, its dynamic range is high, and a scanner or camera with a high Dmax is needed to match the scene accurately
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Photo courtesy of Digital Photography Review, wwwdpreviewcom
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Figure 2-4 At left, a scene that has a wide dynamic range At right, what happens with too little dynamic range to capture the full range of colors
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Dynamic range is measured logarithmically, like earthquakes, with values between 0 and 4 that represent the ratio between the brightest and darkest parts of an image A Dmax range in a scanner or camera of anything over 32 is good A value of 33 is
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ten times better, and 34 is ten times better than 33 Most scanners and cameras compromise in some way because perfect dynamic range is impossible At the low end and midrange, scanner makers don t mention dynamic range But generally, you can figure that the greater the color depth, the more likely the dynamic range is better, too
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The last of your considerations is how a scanner connects to your computer This is simple If you have a Mac, a scanner that supports Firewire is the obvious choice If you have a Windows PC, USB 20 is just as natural If your PC is more than a couple of years old, it may not support USB 20 You can still connect to your USB port at USB 10 speeds But to get the speediest transfer from scanner to computer, you should buy a USB 20 expansion card Or, get a new computer Your call Remember that your need for speed increases with the size of the originals you scan, the number of pixels absorbing light along each inch, and the number of bits devoted to recording color information for each of those pixels Whatever scanner you pick, as soon as you get home, start feeding it those priceless family photos Rescue the photos as digital images before they fade away forever Then you can go outside and play with your new camera
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Here are some web sites that can help make you into a top-notch scanner The links are also on the author s web site, wwwhowcomputersworknet
wwwshortcoursescom/using/indexhtm A Short Course in Using Your Digital Camera, one of the best tutorials you ll find on the Internet wwwkodakcom/global/en/consumer/pictureTaking/top10/ 10TipsMainshtml Kodak s Top 10 Techniques to improve your picture taking wwwkodakcom/global/en/consumer/education/programs/ composition/photoProgramCompMainshtml Kodak s Beginnings of Photographic Composition, a must-browse site wwwphotoexpertepsoncouk/UK/homepagehtm Tips and tricks from professional photographers to get the most out of shooting pictures with a digital camera
Links
http://photosmsncom/editorial/EditorialStartaspx article= macro_msn§ion=NOTEBOOKS Tips on macro photography wwwsunspotphotocom/ssp/lenses/fxfilterhtml Sunspot Photography gives a good, quick overview of the use of filters that are screwed onto the end of a lens http://ccollegehccscctxus/instru/photog/stdpprs/vad1457html Scholarly look at depth of field
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As tempting as it is to rush out and start snapping photos with your new digital camera, wait up a bit Even if you re an experienced film photographer, chances are your digital camera has controls and features that are entirely new to you Sit down with the manual and camera to at least learn the purpose of any button, knob, switch, lens ring, or other doohickey you can t identify We ll encounter some of those controls in this chapter, and you ll learn how to use them to create the photograph that is hovering in your brain To a camera, what s in the viewfinder is just a lot of dots of light It doesn t know what the subject matter is, and it doesn t know what you want to accomplish with a photograph Only you know that The purpose of this chapter is to combine the control on your camera and the vision in your head to create a photograph worthy of framing or displaying on the Web
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