Halftone images are made up of small dots that form an image. If the files are for the web, saving them as a. Grayscale documents should be saved as a. Grayscale images should be scanned at or above 600 DPI in a. Grayscale documents and images are those that do not contain color, but use gradients (shades) of black to produce the image. When scanning line art, it is best to scan at 900 DPI for print and 300 DPI for the web. Types of line art include cartoons, comics, ideographs, or glyphs.
Before photography and halftones were developed, line art used to be the format of choice for newspapers. Line art consists of lines and curves, without the use of colors or shading (gradients). Line art is a form of imagery used in print media and on the computer to enhance documents. If you want to edit the text, use the Optical Character Recognition (OCR) feature on your scanner. When saving text documents it is best to save the files as. If the text is going to be reprinted, a DPI setting of 600 or better is ideal. The lowest DPI that is needed for the scanned text to display and print properly is 300 DPI. Scanning text documents is a relatively smooth process that does not take a lot of time. The file type you select is dependent on the type and purpose of the scanned document. When scanning documents it is critical to choose a proper file type.
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A file that is 4000 x 5000 pixels is ideal for archiving, but would take a long time to download on the Internet. While DPI refers to physical dimensions, the resolution of the image refers to the size of the image relative to your computer screen.
Scanned images with a higher DPI will look more realistic compared to the original, but scanning at a high DPI can take a long time and use large amounts of disk space. DPI is a specification used for printed (and scanned) media that determines quality. When scanning materials it is important to understand the concept of DPI (dots per inch). Scanners capture a digital image of the contents on the surface.
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