Sometime around 2/10/09 (at 08:25 -0400) Robert Bovasso said:
Not to derail this thread, but Keith, what is this about Acrobat and
InDesign not being the same at 100%?
It is quite simple really, and it affects those designing multimedia
PDFs for display at specific sizes. Because of how recent versions of
Acrobat scale things, the relationship between document dimensions
and display pixel dimensions is not the same as it is in any
print-based design app (or screen-based design app for that matter).
Make a document in InDesign, any size as long as it is’t huge. Show it at 100%.
Make a PDF of that and open it in Acrobat. View at 100% in Acrobat…
The size will be quite obviously different.
It doesn’t affect the layout of course, other than things looking a
different size. If you use PDFs for print workthis is fine and you’d
probably never be conscious of the discrepancy. But if you want to
use PDFs as a high-level screen-delivery vehicle (as I’ve done in the
past and am doing at the moment) then you’ll have to come to terms
with this.
This is part of Adobe’s efforts at regularising display dimensions
and relating on-screen document sizes to their printed counterparts.
Except (a) it is only done by one development team within the
company, and (b) it does NOT make sense when it comes to on-screen
design precision OR showing bitmap multimedia content (i.e. movies)
at the proper pixel-for-pixel size.
Look in Acrobat’s Preferences, in the Page Display section. The
Resolution section in my setup has “Use system sessing: 115
pixels/inch” and “Custom resolution: [98] pixels/inch”.
If I set it to use a custom PPI setting of 72 then scaling the PDF to
100% in Acrobat matches InDesign’s 100% view size precisely. BUT this
is not Acrobat’s default or something that can be controlled at the
document level - so no matter what I do, I have no real control over
the pixel dimensions that the document will use on anyone else’s
setup. Sure, I can tell it to show at 100%, to fit width, or other
things like that. But that’s about as precise as drawing with a lump
of coal.
I’m not that surprised that the view scale doesn’t work this way in
the pro-level design apps. A change of this kind would cause major
ructions in the InDesign or Illustrator userbases. My guess is that
Acrobat is seen by its software management team more as a
business-level app, an end-delivery tool most of the time, despite
the high level of prepress, editorial and media authoring
capabilities it has.
k
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