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Advanced Compression Techniques...

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alanbloom

Technical User
Apr 22, 2005
81
GB
I am looking to be able to compress an Adobe document as much as I can without losing too much quality into a PDF document.

Normally, saving from Illustrator only allows you to chose generic options which is applied to all the images. Hence, if you have a small logo that needs detail and a large image that requires heavy compression, you can get a compromise but nothing that treats the images differently.

Is it possible to import the images as you want acrobat to store them? What I mean by that is if I compress those images with photoshop so that I have optimised each on its merits, is it possible to import those into acrobat as they are? My aim is to individually optimise each image, combine them into Illustrator and save as a PDF where Illustrator *doesn't change them at all*?

I've tried 'Import from Clipboard' which seems to be ok but it's not obvious how Acrobat then stores those images...

Sorry if that's confusing
 
You can certainly set up the pics in Photoshop as you wish and then Save As pdf.

If you pick Illustrator Default from the Presets menu, and then go to the compression section of the pdf export window, you'll see that Downsampling is Do Not Downsample. If you like you can also pick ad choose whether you want to add zip or jpg compression or not to various image types.

You can also select Custion from the Presets menu, make your own and save that preset.

If you're using full Acrobat, and you want to print a postscript file (or save as eps) to run through Distiller, you'll get more option in the Distiller settings.

Using OSX 10.3.9 on a G4
 
Hi there

Thanks for the reply. But I probably didn't say what I wanted very clearly.

All the settings 'downsample' etc apply to all of the images regardless within the document. Compressing that as jpeg applies to all the images regardless. If you have an A4 image, which requires more compression but also a small logo that *needs* to be high res and *needs* to remain intact, ie very little compression, then there is no way of getting illustrator to treat those *differently*.

What I was thinking is whether there is a way that Illustrator can import an image and then do not touch it - if you choose 'save as zip' then Illustrator *does still touch it* because it forgets about the compression you apply in photoshop.

But I think you may have answered the question. I'll experiment saving the images as Photoshop PDF (it has limited saving options but will do) and then embedding those into an Illustrator PDF. So I think you've cracked it on the head there :)

Cheers

Alan Bloom
 
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