Tibetan and Himalayan Library - THL

<h3 class="heading-h6"><a name="THLToolboxhomegtScanningampOCRgtScanningImagesGuidelines" class="anchorpoint"></a><a href="/tools/wiki/home.html">THL Toolbox</a> > <a href="/tools/wiki/Scanning%20%26%20OCR.html">Scanning & OCR</a> > Scanning Images Guidelines</h3><p class="paragraph"> </p><h3 class="heading-h1"><a name="ScanningImagesGuidelines" class="anchorpoint"></a>Scanning Images Guidelines</h3><p class="paragraph">The general guidelines for digitizing images by scanning in color negatives, slides, or prints is as follows:</p><ul class="star"><li><strong class="bold">Resolution</strong>: 3000 pixels on the long side. The software may then ask you to specify resolution in addition, but in fact specifying the long side is what determines the actual resolution. This subsequent question just determines what goes into the image header metadata and does not actually influence the image’s resolution.</li> <li><strong class="bold">Bit depth</strong>: 24 bit (full color), which can also be understood as 8 bits per channel. Your scanning software may offer other choices such as 12 or 16 bits per channel, but it is important that you scan the images at 8 per channel.</li> <li><strong class="bold">Editing</strong>: Uncorrected; may do gamma adjustment before scanning, not after.</li> <li><strong class="bold">Color space</strong>: If you are given a choice, select Adobe RGB 98.</li> <li><strong class="bold">File format</strong>: TIFF</li> <li><strong class="bold">Compression</strong>: LZW is okay.</li> <li><strong class="bold">File size</strong>: The images will probably wind up around 20 Mb per scan.</li> <li><strong class="bold">Cropping</strong>: Please crop the scan to the size of the picture. It is a waste of space and resources to scan an area larger than the desired object.</li></ul><p class="paragraph">General guidelines for digitizing grayscale images (line art) are as follows:</p><ul class="star"><li><strong class="bold">Resolution</strong>: 1200 DPI is sufficient for all print and online reproduction of grayscale images</li></ul><p class="paragraph"> *<strong class="bold">Size</strong>: the size for the scan should match the media size within the limits of the scanner (ex. for a drawing/illustration on A4 paper, select A4 (8.5" x 11.69") for the scan and output size) </p><ul class="star"><li><strong class="bold">Bit depth</strong>: 8 bit (grayscale), which can also be understood as 8 bits per channel. Your scanning software may offer other choices such as 12 or 16 bits per channel, but it is important that you scan the images at 8 per channel.</li> <li><strong class="bold">Editing</strong>: Uncorrected; may do gamma adjustment before scanning, not after.</li> <li><strong class="bold">Color space</strong>: If you are given a choice, select Adobe RGB 98.</li> <li><strong class="bold">File format</strong>: TIFF</li> <li><strong class="bold">Compression</strong>: LZW is okay.</li> <li><strong class="bold">File size</strong>: The images will probably wind up between 100-200 Mb per scan.</li> <li><strong class="bold">Cropping</strong>: Please crop the scan to the size of the picture. It is a waste of space and resources to scan an area larger than the desired object.</li></ul><p class="paragraph">When using the Epson Perfection V500 Photo scanner in the Scholar's Lab at UVa, use these settings with the built-in Scanner software:</p><ul class="star"><li><strong class="bold">Document Type</strong>: Reflective</li> <li><strong class="bold">Document Source</strong>: Document Table</li> <li><strong class="bold">Auto Exposure Type</strong>: Photo</li> <li><strong class="bold">Image Type</strong>: 8-bit Grayscale</li> <li><strong class="bold">Resolution</strong>: 1200 DPI</li> <li><strong class="bold">Document Size</strong>: 8.5 x 11.70</li> <li><strong class="bold">Target Size</strong>: Original</li> <li><strong class="bold">Adjustments</strong>: None</li></ul><p class="paragraph">Save as TIFF</p><p class="paragraph">Save the images to the desktop, then copy to an external drive and backup</p><p class="paragraph">Save them in sequence: Scanned_Document_001.TIFF </p><h3 class="heading-h6"><a name="ProvidedforunrestrictedusebythespanclassnobrimgsrcsakairwikitoolimagesicklearrowgifaltexternallinktitleexternallinkahrefhttpwwwthdlorgtargetrwikiexternalTibetanandHimalayanLibraryaspan" class="anchorpoint"></a><em class="italic">Provided for unrestricted use by the <span class="nobr"><img src="/" alt="external link: " title="external link"/><a href="http://www.thdl.org" target="rwikiexternal">Tibetan and Himalayan Library</a></span></em></h3>