http://www.lib.ua.edu/wiki/digcoll/index.php?title=Lines_on_my_lightbox_scan&action=history&feed=atom 2013-05-25T20:53:15Z Revision history for this page on the wiki MediaWiki 1.11.0 http://www.lib.ua.edu/wiki/digcoll/index.php?title=Lines_on_my_lightbox_scan&diff=4397&oldid=prev 2013-01-03T16:22:50Z

<p>content deleted (duplicated elsewhere)</p> <table style="background-color: white; color:black;"> <col class='diff-marker' /> <col class='diff-content' /> <col class='diff-marker' /> <col class='diff-content' /> <tr> <td colspan='2' style="background-color: white; color:black;">←Older revision</td> <td colspan='2' style="background-color: white; color:black;">Revision as of 16:22, 3 January 2013</td> </tr> <tr><td colspan="2" class="diff-lineno">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class='diff-marker'>-</td><td style="background: #ffa; color:black; font-size: smaller;"><div><del style="color: red; font-weight: bold; text-decoration: none;">The vertical lines are a product of the frequency the bulbs in the light box &quot;flash&quot; on and off and the interval at witch the scanhead takes to make a capture (linetime). The dark underexposed line on the image is created when the bulb is not currently on for the fraction of a millisecond that the scanhead is capturing that particular line. The easiest solution is to slow the line time down as low as you can to allow the light to &quot;flash&quot; several times during the capture for that line. Otherwise I have found that the Hz of the lightbox bulb have a relationship with the linetimes at intervals of 60... so setting the linetime to 60, 120, 180, 240, etc. can help to lessen the problem.</del></div></td><td class='diff-marker'>+</td><td style="background: #cfc; color:black; font-size: smaller;"><div><ins style="color: red; font-weight: bold; text-decoration: none;">{{rfd}}</ins></div></td></tr> </table>

Kgmatheny http://www.lib.ua.edu/wiki/digcoll/index.php?title=Lines_on_my_lightbox_scan&diff=931&oldid=prev 2009-05-13T20:20:59Z

<p>New page: The vertical lines are a product of the frequency the bulbs in the light box &quot;flash&quot; on and off and the interval at witch the scanhead takes to make a capture (linetime). The dark underexp...</p> <p><b>New page</b></p><div>The vertical lines are a product of the frequency the bulbs in the light box &quot;flash&quot; on and off and the interval at witch the scanhead takes to make a capture (linetime). The dark underexposed line on the image is created when the bulb is not currently on for the fraction of a millisecond that the scanhead is capturing that particular line. The easiest solution is to slow the line time down as low as you can to allow the light to &quot;flash&quot; several times during the capture for that line. Otherwise I have found that the Hz of the lightbox bulb have a relationship with the linetimes at intervals of 60... so setting the linetime to 60, 120, 180, 240, etc. can help to lessen the problem.</div>

Jjcolonnaromano