User`s guide

INDEX

(Professional Edition only)

This enables writing raw data from the scanner to a TIFF file.

The raw files are the result of the first of two steps VueScan performs: "scanning". The

second step is "processing". These steps are described in the topic "How VueScan

Works" in this User's Guide. By providing a mechanism to cleanly separate these two

steps, VueScan provides great flexibility and offers options not available in most other

scanner software.

You can perform the "processing" step later by setting Input | Source (p. 50) to "File".

This lets you rescan images with different settings, without needing to rescan the

media.

When the raw file is written depends on the setting ofOutput | Raw output with (p. 90).

Raw files are always stored as TIFF files and can therefore be examined in image

viewing and editing programs. Note, however that the resolution of raw files (as

specified inOutput | Raw file type (p. 90)) may be greater than some programs can

read.

Little processing is done on raw files so they are a close representation of exactly what

the scanner has produced. Raw files will not be filtered nor will color settings be

applied. As a result, raw scans may look "wrong".

Raw files contain as much data as the scanner was able to produce before any

modifications may have been made, and are therefore good for archiving.

The image gamma value is 1.0 when there are two bytes (16-bits) per sample, and 2.2

when there is one byte (8-bits) per sample. Raw files saved with gamma 1.0 will look

dark, but this is normal.

The one exception to this is if Output | Raw output with (p. 90) is set to "Save". In this

case, the infrared cleaning and grain reduction is also done before saving the raw scan

files.

Advanced Option: This option is displayed whenPrefs | Enable raw from disk (p. 99) is

set or when not scanning from a file.

Output | Raw file name

(Professional Edition only)

This specifies the name of the TIFF file used to hold the raw data from the scanner.

As well as VueScan writing a specific file name for you, it can also automatically

number your files in two ways by placing special characters in the filename. (See the

beginning of this section for information on how to use this auto-numbering feature.)

The default setting of this option is "scan0001+.tif".

Advanced Option: This option is displayed whenOutput | Raw file (p. 88) is set.