Search (5 results, page 1 of 1)

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Abstract

Scanning systems produce disk files in a number of formats which are identified by the file extensions allocated to them by the software. The format describes what the data looks like and how the scanned image is stored so that the importing software can handle the image. Covers DOS file formats including TIFF, PCX, PDA axnd BMP and Macintosh file formats including TIFF, EPS, MacPaint and PICT

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Abstract

Because recognition is never perfect, OCR software manufacturers allow imperfect results to be edited. OCR uses several methods to assess the level of certainty with which it recognises text. Describes pop ups / text marking, general dictionaries and user dictionaries, zones, templates and decolumnizing. Descusses performance and saving the documents

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Abstract

Discusses factors controlling the speed of image and text processing other than those related to the scanning software. A flatbed scanner taker around 45 seconds to scan a sheet of A4. The computer itself imposes a limit on speed. File size makes demands on resources. A4 ASCII files take about 3,5K, formatted word processed text 7,5K. A4 images require 0,9Mb for black and white, 7 Mb for grey scale and 21,1Mb for colour. Evaluates uses for scanners and compares them with conventional entry routes

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Abstract

Describes the 3 types of image which may be scanned: photographic originals, half toned images and other illustrations usually known as line art. Explains how print produces an illusion of continuous tone. Describes how the resolution of half tone images is measured and how continuous tone images are converted by scanning software to half tones

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Abstract

The quality of the final scanned image depends on the choice of the original and how the software controls are set. Discusses the choice of continuous tone images and halftones continuous tones covering contrast, tonal range, focus, grain size and photographic paper. Explains the controls for image scanning. The most common settings relate to Line Art, Grey Scale, Dithering, Brightness, Contrast and Resolution