Tilman Hausherr created PDFBOX-3932:
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Summary: Image with predictor 15 not rendered correctly
Key: PDFBOX-3932
URL: https://issues.apache.org/jira/browse/PDFBOX-3932
Project: PDFBox
Issue Type: Bug
Components: Rendering
Affects Versions: 2.0.7, 1.8.13
Reporter: Tilman Hausherr
Assignee: Tilman Hausherr
Fix For: 1.8.14, 2.0.8, 3.0.0
Attachments: PDFJS-8895-p1.pdf
In this file, /DecodeParms has an array with 1 element. The filter is a name
object.
The PDF specification has this:
bq. A parameter dictionary or an array of such dictionaries, used by the
filters specified by Filter. If there is only one filter and that filter has
parameters, DecodeParms shall be set to the filter's parameter dictionary
unless all the filter's parameters have their default values, in which case the
DecodeParms entry may be omitted. If there are multiple filters and any of the
filters has parameters set to nondefault values, DecodeParms shall be an array
with one entry for each filter: either the parameter dictionary for that
filter, or the null object if that filter has no parameters (or if all of its
parameters have their default values). If none of the filters have parameters,
or if all their parameters have default values, the DecodeParms entry may be
omitted.
Currently PDFBox takes "whatever is there" from the /DecodeParms array /
dictionary.
So now I tried to implement this literally in PDFBox ("If there is only one
filter and that filter has parameters, DecodeParms shall be set to the filter's
parameter dictionary") and that failed, there are files that have a filter
array with 1 element and have a /DecodeParms array with 1 elemenent and these
render properly with Adobe Reader, but no longer in PDFBox. So that "incorrect"
/DecodeParms array element must be used or it will look bad.
Then I tried to implement that a dictionary would be expected when the filter
was only a name, and that worked, i.e. no regressions, and the SOLR file
renders too.
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