Incomplete Scanning Guide, Cont.
HOW TO DETERMINE THE BEST RESOLUTION FOR AN IMAGE?
To determine the resolution of an image depends on what you plan to do with it once you have scanned it. For example, are you going to display only on your monitor, or are you going to print it out? Because your output device (monitor, printer) has it's own recommended resolution. Setting a resolution above your output devices' capabilities achieves no added benefits, and may in fact adversely affect your image. Note that monitors can only display 72-100 DPI. when a higher resolution image is displayed, it is forced into a 72 DPI convention, so a 150 DPI image will appear twice as large on a 72 DPI screen. conversely if a 150 DPI image looks like it is the right size visually, it will print our at one half the size of the screen image.
SCAN IRREGULAR OBJECTS
You can scan real-world objects small enough to fit on your scanner. Things like buttons, pencils, ties, your favorite dress pattern, almost anything you can think of! Always use caution when placing heavy objects on the fragile platen!
Slides and negatives generally yield a better scan than prints, which are one generation removed from the film original. You must use a slide scanner or a flatbed with a special attachment to do this however. You must also scan at a high resolution and then scale the image up to a useable size from the 35 mm original.
TAKING CARE OF YOUR SCANNER
The scanner should occasionally be cleaned to maintain optimum performance, especially the scanboard glass which is sometimes "read "by the scanner resulting in poor image results. Use a slightly damp cloth with a mild detergent to clean. I recommend an antistatic plexiglas cleaner that has no abrasives in order to reduce static. Never spray liquid directly on the platen- always spray onto the lint free cloth.
YOUR IMAGES PRINT OUT TOO SMALL
This happens when the image resolution is set at a value near, or above the printer's resolution. To solve this problem you need to decrease the image resolution. A helpful way to determine the proper image size before printing is by using the Print Preview mode in PhotoShop.In this mode you can see how big an image appears before you print, allowing you to resize the image accordingly.
COLOR IMAGES AND PRINTERS
If you print color images on a black and white printer, the result is sometimes disappointing. You should first convert the image type from color to grayscale and then adjust the brightness and contrast to make the image look better before printing.
Optical Character Recognition
With the help of an OCR program, graphic scans of textual documents can be translated into information that can then be edited in a word processor. Again, the key is a good quality original. I have had some success, however in working with faxes as well. the OCR software uses a database that matches the image of each letter with a corresponding value in the database. State of the art OCR is amazingly accurate.
Say you want to make a form available over a network. After scanning the document a piece of software called Adobe Acrobat can change it into a.pdf file that can retain the original formatting. Note that the document must be printed out at this point and information must be entered in more traditional ways. You can also create the form in Pagemeker and save as a .pdf. The only way it can be edited in another computer is if the end user also has the full version of Acrobat- The Adobe Acrobat Reader itself is free from Adobe. You may want to also explore the possibility of creating templates in Word to accomplish the task.