barcode printing vb.net I Higher-resolution scanners let you scan small images and print them larger than in Software

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I Higher-resolution scanners let you scan small images and print them larger than
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actual size For instance, you can scan a small picture or a negative and then print it larger than its original dimensions
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I You can scan an image at high resolution and then crop it The cropped and edited result
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will still have enough information to enlarge On the other hand, if you scanned the image at just 200dpi initially, you would have to print the entire image without cropping Why go with lower-resolution scanners That s easy they re less expensive Not everyone needs 2,400dpi, or even 600dpi If your main goal is to scan images for Web pages, for instance, a 300dpi scanner may be as much as you need
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actual resolution of the optics is more important You should use that number to compare scanners when you shop
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Most inexpensive scanners are 24-bit scanners, meaning they can digitize as many as 167 million colors, which also happens to be about as many colors as the human eye can see More sophisticated scanners work at 30, 36, or even 42 bits per pixel, meaning they can distinguish among billions of colors Those scanners with more than 24-bit accuracy have more colors to choose from when resolving dark regions and images with lots of rapid color changes This adds up to a high-quality image If you are serious about scanning your photos, keep an eye on color depth and choose your scanner accordingly If you re scanning snapshots or posting images on a Web site, color depth isn t as important to you
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The concept of dynamic range is a bit complex, so a lot people often skip the topic entirely, much to the detriment of buying a quality scanner I want you to know how to choose the right scanner, though, so we ll discuss the topic a bit A scanner s dynamic range is a measure of how well the scanner can record changes in the brightness of the image it s scanning It s measured on
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a logarithmic scale from 0 to 4, where 0 is pure white and 4 is very, very black (but not pure black, since the scale can extend past 4 by convention, we just use 4 as the upper end) What the heck Well, here s where we re going: The higher the scanner s stated dynamic range, the better it is at discerning shadows and subtle changes in dark colors Since the scale is logarithmic (thought I wasn t going to explain that, didn t you ), every whole number change in dynamic range is a ten-fold increase or decrease in light intensity so a scanner that has a dynamic range of 40 is sensitive to a 10,000:1 range of light intensity in the scanned image You can see what I mean in this graph:
Of course, no scanner is fully sensitive through the entire range from 0 to 4, so many scanners (especially the more professional, expensive models) describe their dynamic range in terms of DMin and DMax Subtract the two to find the scanner s dynamic range If a certain Nikon scanner has a DMin of 3 and a DMax of 36, its dynamic range would be 33
CHAPTER 10: Turning Prints into Digital Images
So who should care about all this gobbledy-gook Anyone who scans slides and negatives That s why you rarely see the dynamic range discussed for flatbed scanners the dynamic range for those gadgets is usually pretty shallow (around 24), and that s all you need to effectively scan prints But slides and negatives store a very deep dynamic range and you ll want a film scanner to have the best dynamic range you can afford, or else you ll lose all the details in your shadows and darker image regions Only film scanners have sufficient dynamic range (usually 32 or higher) to make satisfying scans from film This also explains why slide scanner attachments for flatbed scanners usually generate such awful pictures: the scanner s dynamic resolution is far too low to adequately capture slides and negatives with any modicum of accuracy
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