S E C T I O N H .3
1101
Implementation Notes
10. If an unrecognized filter is encountered, Acrobat viewers report the con-
text in which the filter was found. If errors occur while a page is being dis-
played, only the first error is reported. The subsequent behavior depends
on the context, as described in Table H.2. Acrobat operations that process
pages, such as the Find command and the Create Thumbnails command,
stop as soon as an error occurs.
TABLE H.2 Acrobat behavior with unknown filters
CONTEXT
BEHAVIOR
Content stream
Indexed
color space
Page processing stops.
The image does not appear, but page processing continues.
The image does not appear, but page processing continues.
Page processing stops.
An error is reported and no more thumbnail images are dis-
played, but the thumbnails can be deleted and created
again.
The form does not appear, but page processing continues.
The glyph does not appear, but page processing continues.
The text position is adjusted based on the glyph width.
The viewer behaves as if the font is not embedded.
Image resource
Inline image
Thumbnail image
Form XObject
Type 3 glyph description
Embedded font
11. Acrobat 4.0 and later viewers do not support the combination of the
DCTDecode
filter with any other filter if the encoded data uses the pro-
gressive JPEG format. If a version of the Acrobat viewer earlier than 4.0
encounters
DCTDecode
data encoded in progressive JPEG format, an er-
ror occurs that is handled according to Table H.2.
12. Acrobat viewers do not enforce the restriction on line length.