Fujitsu fi-6000NS Operator's Manual page 216

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When "High Compression for Color PDF" is selected, characters and
backgrounds on the document are compressed separately. In order to do this,
the file size of the document that mostly consists of text characters becomes
smaller while keeping the quality of the characters as they are. However, this
mode is not appropriate for scanning photographs or pictures since these
graphical materials are recognized as background and compressed as such,
causing degradation in the scanned image. If this setting is specified, the
contrast of the image may become higher.
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When one color page is scanned, the file size criteria are shown as follows.
These numbers are for reference, other documents may vary in size.
Actual paper size: A4 size (general catalog)
File format: PDF
Scanner paper size setting: A4
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File size (KB) for color files
Resolution Low
150dpi 439
200dpi 721
300dpi 1656
600dpi 5472
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File size (KB) for black & white files
Resolution Cannot be set for...
150dpi 44
200dpi 70
300dpi 141
600dpi 472
Medium
Medium
Low
243 206
386 324
795 662
2592 2176
Medium
High Compression
High
for Color PDF
159 95 108
248 149 145
491 278 111
1670 896
High
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