Understanding 'flattening artwork'

Actually, Jacob's response may have solved it for me.

To show you how dumb I am about illustrator and its facilities, when I read Jacob's comment (and Scott's second one initially), I read Windows and wanted to say "I am using a Mac".  Now having been around the system some more, I realize the vast windows menu options.  I tried Document Info.  Even then I missed what you were saying about ticking objects for a while, then got it.

All is good, no transparent groups or objects...  First time with a package like this.  I used to use Coreldraw years ago, so a very different approach.

Thnx guys...

So Scott, excuse my ignorance (and my inverted commas which were trying to highlght what I considered jargon and therefore were the ares around which I was unsure).

I have followed your second post...part of my graphic is red, the remainder in its orginal colour.  If I understand you, this means that particular section has not been flattened yet.  If that is the case, the procedure I followed was to:

Open the layers pop-out.  Only 1 layer appears (hence my original comment about choosing a layer), but with a number of lines beneath when expanded.  One of the lines below, further expands by one object.

I then just highlighted the single line called layer 1 (I think it was already highlighted as there is only one).

Then from the additional menu, clicked flatten artwork.  But nothing seemed to happen (not sure if I should see any activity at this stage).

When I open the additional menu again, flatten artwork is still available, in other words hasn't disabled, which I rather expected it to do if it had worked.

To give yo more background, the reason I am doing this and trying to follow this route, is that I am loading the resulting PDF to an online printing site (that particular site for many other reasons).  The first attempt printed with some strange anomolies and their tech team suggested I 'flatten'...so I was bllindly following their advice.  Their online help also suggests the PDF version should be later than 1.3 I think...

Anyway, if you can advise on my flatten preview comment above, I would appreciate it.  Sorry to be so lame.

Thnx for the input guys, gives me a great deal of useful info for other purposes and in genereal, but I am hoping someone is able to

answer my question as posed.

How do I know if I have successfully flattened my artwork, having gone through the steps mentioned?

You “don’t” need to put quotes “around” every fourth word “for” us to understand you. We use “this” program all the time “and” the terms are very familiar “to” us.

Illustrator lets you use various transparency effects, like drop shadows, opacity masks, or simply changing the opacity of an object from normal 100%. The problem is that sometimes a print shop might not have recent software and hardware (although by now, “recent” means less than a decade). These older workflows can’t render or print objects with transparency, so the appearance need to be flattened, meaning the same appearance is created, but without any transparency.

In the above example, I have two overlapping objects. The blue circle is using different transparency effects for its fill and its stroke.

If I flatten it I still see the same image, but editing is a nightmare because it is now, ugh, 16 objects.

The good news is that one almost never needs to flatten transparency. If you are saving your artwork for someone using Illustrator, just save the file in the appropriate version. If the version is higher than 8, then much transparency is maintained. For working within Illustrator, and especially within the same version among different users, there is no need to flatten.

If, however, you are saving a PDF for a printer and they reqire flattened artwork, you can take care of that on save. I suggest you use File > Save A Copy, choose PDF, then make sure the Compatibility is set to “Acrobat 4 (PDF 1.3)”. This version does not support transparency, so requires artwork to be flattened. In the Advanced panel you can choose te flattener preset Illustrator will use and, if you wish, edit it.

Illustrator will then save your file as a PDF with all artwork flattened. If you used Save A Copy, then the original Illustrator file is unaffected and your transparency effects are safe.