[tex-live] [pdftex] PDF 1.5 by default in TL 2010

Joseph Wright joseph.wright at morningstar2.co.uk
Wed Jan 13 21:29:01 CET 2010

On 13/01/2010 20:11, Reinhard Kotucha wrote:
>   >  What 1.5 features are you talking about precisely? I'm not sure the ones
>   >  used in microtype.pdf are really standard 1.5... did you verify?
> As far as I understand the 1.5 spec, layers (OCG groups) were
> introduced in 1.5.  This is what microtype.pdf is using.  You can
> verify if you open the layers panel in a recent AR.

Quite true, and possibly shown only by Acrobat/Reader (for example, 
Preview on Mac OS X doesn't seem to manage these). However, such 
features are not relevant to the discussion about the default output 
from TeX Live, as this type of thing does not appear simply by switching 
from PDF-1.4 to PDF-1.5.

The key question is whether the features (essentially the compression 
stuff) that does appear on adding


to a document which gives a fully-functional result without them. 
Documents which use \special's, etc., to introduce PDF features directly 
are going to potentially fail whether TeX Live produces PDF-1.4 or 
PDF-1.5 files.
Joseph Wright

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