FixYa.com
Technical Support, Instructions & Repair Service
Home | My Products | Sign In

Online User Manual and Guide for Umax Astra 2000U Flatbed Scanner

Umax Astra 2000U Flatbed Scanner > User Guide
Showing Page 111 out of 120 Previous     107 108 109 110 [111] 112 113 114 115     Next
Search keywords inside this manual:

Showing Page 111 out of 120 Previous     107 108 109 110 [111] 112 113 114 115     Next

Sponsored Links

FixYa does not evaluate or guarantee the accuracy of any information provided through its proposed solutions, posts, or Expert Assistance Sessions. By entering this site you declare you read and agreed to its Terms. You may NOT copy or distribute the content that appears on this site without written permission from FixYa Inc.
© 2005-2008, FixYa, Inc. or its affiliates
UMAX Astra 2000U/P Owner’s Guide 111 Highlight-The brightest part of an image that still has detail. Setting a highlight point in an image is arguably the most important step to achieving a good scan. Histogram-A bar chart that represents the pixel count of an image. The bar chart has a scale from 0-255, which represents 2 to the 8th power or 256 levels of gray. All images, even a Polar bear in a snowstorm should have a histogram that extends from 0 (darkest area) to 255 (lightest area). ICC-International Color Consortium LAB-A color space that most closely resembles the color spectrum a human eye can perceive. [L] represents the lightness or luminosity of the image, [A] represents the Red/Green axis, [B] represents the Blue/Yellow axis. These values are plotted at right angles to each other in a three dimensional manner. Linearization-The process of calibrating a scanner’s white point, 50% gray point and black point. This is usually accomplished by scanning a grayscale target. Line art-An image having only one level of contrast or (1) bit depth. A line art image can be either Bitmap or vector. LPI-Lines Per Inch. Also referred to as line screen. The greater the LPI the more continuous looking the image will appear to the human eye. A newspaper is generally printed at 85-100 LPI while magazines are printed from 133-175 or higher. OCR (Optical Character Recognition)-A process which assists an input device in converting pixels to ASCII information. Pixel-An abbreviation for "Picture Element'. The basic building block of computer images.