Adobe Illustrator Artwork Article Index for
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Information About

Adobe Illustrator Artwork




  Extension <tt>ai</tt>
  Owner Adobe Systems


Adobe Illustrator Artwork ('''AI''') is a Proprietary File Format developed by Adobe Systems for representing single-page Vector-based Drawings in either the EPS or PDF formats. The '''.ai''' Filename Extension is used by Adobe Illustrator .

Early versions of the AI file format are true EPS files with a restricted, compact syntax, with additional semantics represented by Illustrator-specific DSC Comments that conform to DSC's Open Structuring Conventions. These files are identical to their corresponding Illustrator EPS counterparts, but with the EPS procsets ( Procedure Sets ) omitted from the file and instead externally referenced using %%Include Directive s.

Recent versions of the AI file format, including the PDF-based formats and recent EPS formats, are based on a native format called PGF that is unrelated to both EPS and PDF. PDF compatibility is achieved not by extending the PDF format, but by embedding a complete copy of the native PGF data within the PDF file. The same kind of “dual path” approach is also used when recent versions of Illustrator are saving EPS-compatible files.


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