Hallo,
die folgende Aussage habe ich vom Enfocus Support erhalten:
Hello,
Our PDF experts have reviewed the file and determined the following:
When you are saving the file in Acrobat > Save as > Optimized PDF > PDF 1.4 saved without transparency flattening, then if the Transparency checkbox is unchecked, then no transparency flattening is done during optimized save, and therefore no shifting of the images occurs. If this is indeed what you’re doing, then there should not be a problem.
This message that you are getting "The PDF document contained image masks that were not recalculated" is completely harmless. It just means some image mask was not re-compressed, likely because either re-compression would not have resulted in a smaller size, or because the chosen compression does not properly support the required format.
If you are saving the file in Acrobat > Save as > Optimized PDF > PDF 4.0 and later (which gives you a PDF 1.3) this is where we see the image/mask shifts. This is of course an issue. Again though, this only happens when flattening transparency.
Unless your workflow requires transparency to be flattened, we strongly advise to keep it in and let the RIP (or another component as late as possible in the workflow) handle it.
There is indeed nothing wrong with the image mask itself. As mentioned before, the warning about re-compression is harmless. The problem is that there is a clipping path that is larger than the page size limitations that used to be in older PDF versions. These limitations have since been relaxed, but it looks like Acrobat's Flattener has a bug related to such large objects.
To see the clipping path, select everything with PitStop Pro (use Ctrl-A or Cmd-A, don't drag-select), and zoom out all the way (I had to zoom out so the document was 1%). Alternatively, you can select everything (again, Ctrl-A) and check the Position and Size tab on the Inspector. You'll see the size is about 182 km both vertically and horizontally.
If you remove this huge clipping path (selecting it can be a bit challenging; use the object browser or shift-selection) and then flatten transparency, then the image masks will be fine.
When you do this, do you still get that “re-compression warning” if the huge clipping path is removed from each page?
Unfortunately, we can't think of a check for such a big clipping path, nor an automated fix. Also note, that this appears to be an Acrobat-specific issue; the Adobe Flattener we use in PitStop Server does not have the issue.
Da ich immer bei PDF's die Transparenz reduziere (z.B. Flyeralarm will PDF 1.3) hilft mir das nicht weiter.
Wie kann ich noch in Zukunft der Transparenzreduktion vertrauen?
MfG
Burckhard
als Antwort auf: [#576590]