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http://bugs.kde.org/show_bug.cgi?id=159007
------- Additional Comments From alberthilbert hotmail it 2008-03-10 17:00
-------
> I think that doesn't make sense. If we really will come to the point
> where we can save back annotations to a PDF document, we have to stay
> compatible with the PDF definitions of stamp annotations. And there is
> no way of storing a custom image stamp...
This is false!
PDF Reference, Sixth Edition, version 1.7
(http://www.adobe.com/devnet/acrobat/pdfs/pdf_reference_1-7.pdf), page 635
states:
a rubber stamp annotation (PDF 1.3) displays text or graphics intended to look
as if they were stamped on the page with a rubber stamp.
The annotation dictionary entries specific to this type of annotation are:
KEY TYPE VALUE
Subtype name (Required) The type of annotation that
this dictionary describes; must be Stamp
for a rubber stamp annotation.
Name name (Optional) The name of an icon to be used in
displaying the annotation. Viewer
applications should provide predefined
icon appearances for at least the follow-
ing standard names:
Approved Experimental
NotApproved
AsIs Expired
NotForPublicRelease
Confidential Final
Sold
Departmental ForComment
TopSecret
Draft
ForPublicRelease
Additional names may be supported as
well. Default value: Draft.
Note: The annotation dictionary’s AP
entry, if present, takes precedence over the
Name entry; see Table 8.15 on page 606
and Section 8.4.4, “Appearance Streams.”
As you can see from the table, the aspect of stamp is specified by a Name entry
or by an AP entry (that takes precedence over the Name entry). For the moment,
okular provides only 4 symbols (okular, kde, bookmark, information), no one of
them may be "safely" associated to the standard names reported in the
specifications. The AP entry is an appearance dictionary specifying how the
annotation is
presented visually on the page. The entries of a appearance dictionary are:
KEY TYPE VALUE
N stream or dictionary (Required) The annotation’s normal
appearance.
R stream or dictionary (Optional) The annotation’s rollover
appearance. Default value: the value of
the N entry.
D stream or dictionary (Optional) The annotation’s down
appearance. Default value: the value of the
N entry.
As you can see, the appearance of the annotation in this case is described by a
stream and so may well contain an arbitrary image or text.
The AP mechanism is very important because even when okular will offer a symbol
for each standard name they will be simply not enought for the generic user
necessities.
Ciao...
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