This collection provides researchers with facsimile images of document pages and illustrations. Document page images are offered as TIFF (Group 4 compressed) images. Illustration images are offered as PCX images.
These types of images are not supported by standard WWW browsers. In order to view these images, special viewers must be configured for use with your WWW browser. You may download any viewer that supports these formats (such as Docuview) and configure your browser to launch the appropriate viewer for each format. See the instructions for your browser to learn how to configure helper applications. More information on image viewers.
If your computer already has software, such as HiJaak Pro, that supports all three image types, you can configure your browser to launch that application when TIFF and PCX images are encountered.
The digital image set that is part of this collection reproduces both line art and halftone illustrations from the originals. "Line art" is the printers' term for drawings or charts that do not depict shades of gray. Halftones are printed versions of photographs or other art in which shades of gray are represented as patterns of dots--the familiar form of picture reproduction found in everyday newspapers and magazines.
Line art can be easily reproduced in the computer. One version of each original line-art image is included in this set; depending on your image viewer, you should be able to scale (resize) the images. You can scale the images down ("zoom out") to see them in their entirety on the computer screen, or scale them up ("zoom in") for a closer look at details.
Two factors make halftones much harder to reproduce in the computer than line art. First, the pattern of pixels (digital picture elements) produced by a scanner may intersect with the printed-halftone dot pattern to produce a bothersome moire effect. In this edition of the collection, special "dithering" software has been used to reduce the moire patterns. Second, images derived from halftones--even if dithered--cannot be scaled to good effect. Scaled down images from printed halftones will darken, losing detail.
Several of the documents include tables, e.g., a financial report from an organization. In general, the content of these tables is included in the searchable full text. Depending upon the font you have selected for display, and upon other variable factors in the software, printer, and computer system, the columns in these full-text tables may or may not be properly aligned. In some cases, they will fail to align on screen but will align when printed.
In order to view the tables, refer to the image of that page.
am 07-02-96