i'm seeing some strange behavior with concatenation.
i have individual PDF files (1-2 pages each) that have a pantone-colored box
in the header of the page. these individual PDF files look great.
i then use iText (java) to concatenate them into a single PDF via the
prescribed concatenate technique (adapted from the
Concatenate.javaexample.) this works well except for one problem:
all of the pages' header
boxes "inherit" the color of the box on whatever is the first page in the
sequence.
so, if i have 3 single-page PDF files with pantone-colored rectangles in the
header:
1. blue box
2. orange box
3. brown box
those 3 PDF files look perfect. after concatenation, one would obviously
expect the same sequence, but all 3 would be blue. (or whatever the color
is of PDF #1). everything else about the pages (text, fonts, layout,
EVERYTHING) is perfect. only that rectangular pantone box has the wrong
color -- a valid color, not a random one or not-quite-the-right-shade color,
just the one belonging to page #1 for all pages.
i haven't been able to find any documentation that describes anything
different that needs to be done to handle concatenation when pantone colors
are involved. i've tried some variations (with/without smart-copy, etc) to
no avail.
any ideas?
thanks much!
=====================
public int concatenatePdf(List<File> pdfList, File destPdfFile, boolean
makeEven) {
int pageCount = 0;
if (pdfList == null) {
return pageCount;
}
// concatenate into single PDF
Document document = null;
PdfCopy writer = null;
for (File srcFile : pdfList) {
// open the source for reading
PdfReader reader = getPdfReader(srcFile);
if (reader != null) {
// prepare the destination for writing
if (document == null) {
document = new Document(reader.getPageSizeWithRotation
(1));
try {
writer = new PdfSmartCopy(document, new
FileOutputStream(destPdfFile));
} catch (Throwable e) {
log.error("unable to write to output pdf: " +
destPdfFile.getPath() + ":", e);
return 0;
}
document.open();
}
// concatenate pages, ignore form fields and bookmarks if
any
pageCount += importPages(reader, writer, srcFile);
}
}
if (makeEven && pageCount > 0 && (pageCount % 2) == 1) {
File srcFile = PdfAssembler.getBlankPageFile();
// open the source for reading
PdfReader reader = getPdfReader(srcFile);
if (reader != null) {
assert (document != null);
// concatenate pages, ignore form fields and bookmarks if
any
pageCount += importPages(reader, writer, srcFile);
}
}
if (document != null) {
document.close();
}
return pageCount;
}
protected PdfReader getPdfReader(File srcFile) {
PdfReader reader = null;
try {
reader = new PdfReader(srcFile.getPath());
reader.consolidateNamedDestinations();
} catch (IOException e) {
log.error("unable to read src pdf: " + srcFile.getPath() + ":",
e);
}
return reader;
}
protected int importPages(PdfReader reader, PdfCopy writer, File
srcFile) {
int pageCount = 0;
PdfImportedPage page;
int n = reader.getNumberOfPages();
for (int i = 1; i <= n; i++) {
page = writer.getImportedPage(reader, i);
try {
writer.addPage(page);
pageCount++;
} catch (Throwable e) {
log.error("unable to add pdf page " + i + ": " +
srcFile.getPath() + ":", e);
}
}
return pageCount;
}
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