Formex Version 4

The image formats

Preliminary remarks

This part of the physical specifications clarifies the use of TIFF as format for images which are included in Formex instances (INCL.ELEMENT).

The specifications are based on the international standard TIFF (Tagged Image File Format), version 6.0, described in the document

TIFF Revision 6.0

The TIFF standard

The TIFF 6.0 specifications are composed of two parts. The first one describes the kernel of the standard. It has to be fulfilled by any tool which is said to be TIFF compatible. The second part contains extensions which have been added for special purposes. Therefore they may not be available in all tools.

The kernel describes four image types:

All tools which are compliant to TIFF 6.0 have to handle these four formats.

The specifications of compression algorithms within the kernel of the standard are limited. For images in black and white, two methods are allowed: TIF_G3 and PackBits. The other formats only support the method PackBits.

The format TIF_G4 was introduced as recommendation by CCITT for the encoding of fax transmissions. Its only interest consists in the higher rates of compression. As this format is not part of the kernel, it is not supported by all tools on the market.

Images within Formex deliveries

Within the Formex deliveries the Publication Office only accepts TIFF images which can be displayed by Quick View and Imaging and be inserted into Word 97 documents.

For these reasons, only the following formats will be accepted by the Publication Office:

The resolution has to be set to 400 dpi.

For compatibility and legal reasons, all extensions of the standard are forbidden.

Control of the image formats

The TIFF images have to be controlled by means of the library LIB TIFF V3.4 which is available from the Internet site

http://www.libtiff.org/.

The images have to be recognized by the tool TIFFINFO. They have to follow one of the above-mentioned formats as specified by the kernel.


Formex 4 - Physical Specifications - Catalog
Contact: OP A1.002 "Formats, Linguistic Informatics and Metadata"
Version: 5.59 (20170418)