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Forskellen på Illustrators *.ai og
Fra :
Madsen
Dato :
29-12-02 15:11
Hej,
Tidligere her i gruppen har der været snak om hvad forskellen mon
er på at gemme i *.eps eller *.ai i Illustrator og hvorfor der i
det hele taget er mulighed for begge formater når de tilsyneladende
er ret ens. I går ramlede jeg ind i et indlæg fra Paul Asente som
forklarer det ret detaljeret og vil derfor bringe det videre her.
| In this message assume that when I write "EPS file" that I'm
| referring to an Illustrator-generated EPS. Other programs can
| write EPS files that are nothing at all like AI files. I'll also
| describe how PDF format fits in:
|
| Up through Illustrator 6:
|
| The content portion of an AI file and an EPS file are identical.
| The EPS file includes PostScript procedure definitions (called
| procsets) that allow the content part to be rendered by a
| PostScript printer.
| EPS files can optionally include a pre-rendered preview so that
| programs that can't interpret the PostScript code can display a
| low-resolution version of the image for reference. AI files leave
| out the procsets so that they can be smaller.
|
| Illustrator 7 and 8:
|
| No practical difference at all. AI files always contain the
| PostScript procsets. Disk space has become plentiful enough that
| the space saved by leaving out the procsets was no longer worth
| the hassle of making people worry about which format to save in.
| Only real difference is that EPS files can still contain previews.
| Illustrator can also write out PDF files, but they are not
| round-trippable: if you read the PDF file back into Illustrator,
| you lose document structure, although the results should look the
| same.
|
| Illustrator 9:
|
| EPS and AI completely different; AI is now based on PDF and
| Acrobat can open AI files. An EPS file contains two parts, one is
| a PostScript-renderable version of the illustration, and the other
| a compressed version of the old AI format. Illustrator ignores
| the PostScript portion when you read the file back in and only
| uses the AI portion; printing uses only the PostScript portion and
| ignores the AI portion. AI files contain a PDF rendition of the
| illustration instead of a PostScript version and also include the
| compressed AI format. llustrator ignores the PDF content when you
| read the file back in; Acrobat ignores the AI portion. A PDF file
| is basically identical to an AI file but you have the option of
| leaving out the compressed AI section to make the file smaller for
| online distribution.
|
| Illustrator 10:
|
| Pretty much the same as Illustrator 9, but added the option when
| saving an AI file to omit the PDF rendition of the Illustration.
| It's still a PDF file, but if you open it in Acrobat all you see
| is a page with a canned message stating that the file was saved
| without PDF content.
Tråden kan findes i <news:alt.graphics.illustrator> startende med:
<news:auh6pm$2ot$1@sun-news.laserlink.net>
--
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