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AI file format
Images stored in this format lack gridded pixels and are a creation of the Adobe Illustrator program. It is made up of lines connecting points. The format is used in SMI and logo images creating. In the event that the image size is increased, it does not lose its quality due to a lack of raster image data. AI is made up of a header, strings for identification, and graphic elements. Graphical images are presented in the EPS format.
AI files were previously referred to as PGF and closely resembled PDF file format. PGF files became compatible with PDF. The copy was embedded into a saved PDF file. Similarly, this dual path system applies to Adobe Illustrator's current versions when files compatible with EPS are created and saved. The files are saved in the form of images without gridded pixels. Enlargement of the image cannot lead to a loss of image quality.
ACD Systems Canvas
Adobe Illustrator CS