General Guidelines

Images may be produced as bitonal, grayscale or color. Generally, images containing black and white text only are delivered as bitonal images. Illustrations/photographs and color text are segmented and produced in either grayscale or color, depending upon the original. Techniques are applied to suppress moiré patterns in illustrations and photographs.

Images are cropped to include as much of the original page as possible while avoiding the detection of page edges and gutter shadows. Images are deskewed and thresholding is applied to ensure the best possible result.

Standard Product

Images are produced in bitonal, and are accurate representations of the original material.

Processing includes automatic deskewing, despeckling, clamp removal (APT 1200 scanning only), cropping, removal of specs and other artifacts outside the textblock, centering, automatic image segmentation and conversion to bitonal.

Primary output is produced in TIFF at 300 dpi. Files of text pages are small in size (<100K); files with graphics are larger, depending upon the size and density of the graphics. These images can be used to produce a PDF, which will be suitable for online viewing.

OCR is highly accurate when applied to these images.

Printing from a PDF yields excellent results at this level.