Recommended Settings
The setting options for the various CGM options are restricted by the different profiles. Nevertheless, the choice is not easy. You should therefore generate CGM files to suit the given application.
For example, imagine a CGM file is to be used in other applications, e.g. computer publishing systems.
In this case, you should check exactly which type of CGM files the target program can read. Most programs currently only support CGM in version 1 from 1987. This format does not recognize curve definitions and there are drawbacks as regards the compression of pixel data.
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If you export your illustrations as CGM version 1 files, you should also archive an original of the Arbortext IsoDraw file, since the structural losses are considerable even if the printout is correct.
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You can then use the Arbortext IsoDraw file at a later date to generate CGM version 3 or 4 files, e.g. if your computer publishing system supports this version.
Imagine that a CGM file is only to be exchanged between Arbortext IsoDraw systems, but must still be compliant with one of the CALS, J2008 or ATA standards.
In this case, you can generate CGM version 4 files immediately. If pixel data is saved, you should activate CCITT group 4 and JPEG or PNG compression.
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In this way you can generate a CGM file that complies with the latest standards. At the present time, however, this file can only be read by a small number of other programs.
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You should always archive Arbortext IsoDraw originals. You can then use these files at any point in time to attain the best possible CGM quality, the Batch process command on the File menu also enables you to do this automatically. This will allow you to make full use of the capabilities offered by computer publishing systems, which at the current time are restricted in their ability to read CGM files.
Imagine you want to generate WebCGM files.
You should always archive Arbortext IsoDraw originals. WebCGM can currently store only a few hyperlink types and as a result e.g. self-defined object info is lost.
Select version 4 and the compression types CCITT Group 4 and JPEG or PNG.
