I.R.I.S. Readiris 14 for Windows User Guide - Manual (Page 70)

Readiris TM 14 – User Guide
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Load PDF documents in color
This option does exactly what it says: it opens PDF documents in
color.
Deactivate his option if you want to open PDF documents in black-
and-white, to speed up the opening process.
Smoothen color images
This option is selected by default. It improves the appearance of
color and grayscale images in your documents.
Note: with some scanners, image smoothening is required to
recognize color and grayscale images successfully.
Process as 300 dpi
Select Process as 300 dpi when you are processing images of an
incorrect or unknown resolution. The images will be processed as if
they had a 300 dpi resolution.
Fast Binarization (Readiris Corporate)
When you are opening many image files at the same time, it is
recommended to activate Fast Binarization. This option increases
the processing speed considerably.
Tip: avoid selecting this option when scanning very low-quality
documents.
Page range
Use this option when you only want to open a certain section of
multipage TIFF or PDF files.