User`s guide

INDEX
90
Output | Raw size reduction
(Professional Edition only)
You can use this option to write files with a reduced number of pixels. For instance, if
size reduction is set to 3, then every 3x3 block of pixels in the image will be written as a
single pixel, which is the average of these 9 pixels.
However, this option produces better results than reducing the resolution of the scan,
as the averaging of multiple pixels results in a similar noise reduction benefit as
multi-sampling. See Input | Number of samples (p. 59)and Input | Number of passes
(p. 59).
This option may not be appropriate for use with raw files when your purpose is to
archive the scanner's output. For most users leave the value set at the default of 1 (no
reduction).
If, however, you always scan at a high resolution and then use size TIFF/JPEG
reduction when saving the crop file, Raw size reduction may be appropriate because it
results in significantly smaller files while still gaining the benefit of scanner noise
reduction.
If you do use Raw size reduction, you probably will not want to use TIFF/JPEG size
reduction later when scanning the raw file from disk.
Advanced Option: This option is displayed whenOutput | Raw file (p. 88) is set.
Output | Raw file type
(Professional Edition only)
This option describes the resolution of the raw file, in bits per pixel. It should normally
be set to Auto, which defaults to bits per pixel of the scanner.
Advanced Option: This option is displayed whenOutput | Raw file (p. 88) is set.
Output | Raw output with
(Professional Edition only)
This specifies which operations in VueScan cause the raw scan data to be written to a
file.
If set to "Scan" (or "Preview"), the raw file is written at the same time as the scan (or
preview). In this case, the raw file has not had infrared cleaning or grain reduction
applied.
Assuming that the preview is used primarily to prepare for the final scan, this option
should normally be set to "Scan" so that the highest resolution raw image can be saved.
If set to "Save", it is written at the same time as other files are written (i.e. after a scan
completes or when the Save button (p. 48)is pressed). In this case, the raw file has
had infrared cleaning and grain reduction applied.