![]() ![]() ![]() At 600 ppi, those same lines remain unbroken and reproduce with much smoother edges.įigure 1: The 600-ppi scan (right) of the image appears much smoother than the 75-ppi scan shown at left. At low-resolutions, such as 75 ppi, black-and-white scans can exhibit serious artifacts, including broken lines and aliasing - which refers to the jagged staircase pattern on curved or diagonal edges. Figure 1 illustrates how your choice of resolution affects the final image. In general, you can increase the quality of a black-and-white scan by increasing the resolution. For example, if you intend to print a black-and-white line-art image on a 600 dpi laser printer, then you should scan at 600 ppi. ![]() Scanning black-and-white originals is actually a fairly straightforward process because there is a one-to-one correspondence between the resolution of a scanned line-art image (measured in pixels per inch, or ppi) and the resolution of the printer (measured in dots per inch, or dpi). Line-art drawings and technical illustrations are obviously black-and-white images. But a blueprint, a purple-hued company logo, or a red text headline could also be scanned as black-and-white images. Regardless of the actual color used, an image qualifies as black-and-white artwork if it consists of only one color without any tonal variation. For the purposes of this discussion, all artwork falls into two basic categories - black-and-white line art and continuous-tone images. To determine the best scanning resolution, you need to consider two factors - the resolution of the final output device and the type of artwork you are scanning. Here we’ll help you do just that, by focusing on the optimum resolution you should use when scanning images for printed output. If you really want to do the best job possible all the way around, then you should strive for efficiency in your scanned images as well as quality. But too often designers interpret this responsibility as a mandate to scan original artwork at very high resolutions, which produces large files that eat up disk space, are difficult to transfer to a service bureau, and take a long time to process at output time. Your first goal as a conscientious print designer is to create the highest quality scanned images for your clients. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |