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S E C T I O N H .3 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 Page processing stops.
Indexed color space The image does not appear, but page processing continues.
Image resource The image does not appear, but page processing continues.
Inline image Page processing stops.
Thumbnail image An error is reported and no more thumbnail images are dis-
played, but the thumbnails can be deleted and created
again.
Form XObject The form does not appear, but page processing continues.
Type 3 glyph description The glyph does not appear, but page processing continues.
The text position is adjusted based on the glyph width.
Embedded font The viewer behaves as if the font is not embedded.
3.3.7, “DCTDecode Filter”
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.
3.4, “File Structure”
12. Acrobat viewers do not enforce the restriction on line length.
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