Image capture

Desktop Color, Continued Image capture The three types of image capture are line art, grey scale, and color. LINE ART: Line art is images that are either black or white and have no gradations in tone. Line art scanners record black as one bit and white as one bit. This is called one-bit or bilevel scanning. Simulating halftones in the scanned image is known as dithering. GREY SCALE: Grey scale scanning is for continuous-tone art. The scanner assigns grey levels based on the light that reflected from or passing through the original image. Increasing bits per pixel (pixel depth) increases the number of greys recorded and proportionally increases file size. Eight-bit scanners produce 256 levels of grey. COLOR: Desktop color scanners usually allow 8 bits per spectral primary and 8 bits for black totaling 24 bits of information per pixel. This creates a palette with more than 16 million available colors. Color monitors should be capable of displaying 24 bit color. Convert images scanned as 24 bit color to 8 bits before displaying the image on monitors incapable of displaying 24 bit color. Color monitors Color monitors display images and text while you work in the document. The resolution and accuracy of a desktop system depends heavily on the quality of monitor. Monitor resolution is defined by dpi (MAC) or pixels (PC). Screen size is measured diagonally across the monitor face. Large monitors that display a full page or a two-page spread horizontally are ideal for the DM and this type of monitor accuracy is often called WYSIWYG (pronounced whizzywig), an acronym for What You See Is What You Get. WYSIWYG monitors and appropriate software allow the DM to create and correct art and copy with unparalleled accuracy. What you see on the horizontally oriented screen is exactly what the hard copy should look like. Vertically oriented monitors are called portrait monitors. 2-37