Epson ES-300C User Manual - Page 44
Minimizing the Moiré Pattern, Transparent document, Thin materials, Using the Scanner
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Tips on Using the Scanner Transparent document Transparent material may not be scanned properly because the ES-300C scanner scans an image by reflecting light off the document surface. In the case of overhead projector transparencies, if you can clearly recognize the image on a transparency by placing it on an opaque surface, it can be scanned. Film negatives or 35 mm slides cannot be scanned because the images on them are too dark and too small for the scanner to recognize. Thin materials When the document paper is too thin, the image on the reverse side of the page or on the next sheet of paper may appear as a ghost-like image superimposing the desired image. If this "bleed" occurs, photocopy the image on a heavier bond paper and rescan the image. Minimizing the Moiré Pattern A moiré pattern is the repeating interference pattern that appears overlapping a scanned image. This usually occurs with printed material processed with screens and when the pitch of the screen interferes with that of the scanner's sensor. Moiré does not occur with ordinary photographs because they do not cause interference. Although a moiré pattern does not occur often, once it occurs it is difficult to remove completely. To minimize the effect of the moiré pattern, you may try the following: l Place a transparent plastic sheet between the document and the document table so that the document is slightly out of focus. l Place the document slightly angled or move its position slightly. l Consult your software manual for other solutions. Using the Scanner 2-19