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https://issues.apache.org/jira/browse/PDFBOX-4556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16867789#comment-16867789
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Tilman Hausherr commented on PDFBOX-4556:
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1) "I have also wrote the appearance stream hard way as you mentioned but not
got any visual representation for that" ==> *please share the result file*
2) re the exception: only the two lines at the beginning and the two last lines
are relevant, the code between (with {{PDDeviceRGB}}) is a misunderstanding by
you - you used the code I showed that was meant to tell you where the
{{IllegalArgumentException}} came from. This is not needed in your code!
What kind of exception do you get when calling {{new PDJpeg(doc, bufferedImage,
compression)}} ? You didn't mention. At what line?
Besides, the best way to work with jpegs is to use the stream directly (only if
it is a JPEG stream!!!), as I did in the sample code {{new PDJpeg(doc, new
FileInputStream(tickImagePath))}}.
It may be possible that whatever you are using doesn't have a good jpeg
handling library. Try [https://github.com/haraldk/TwelveMonkeys] .
For jpeg you'll need these files:
{{twelvemonkeys-common-lang-3.4.1.jar}}
{{ twelvemonkeys-common-io-3.4.1.jar}}
{{ twelvemonkeys-common-image-3.4.1.jar}}
{{ twelvemonkeys-imageio-core-3.4.1.jar}}
{{ twelvemonkeys-imageio-metadata-3.4.1.jar}}
{{ twelvemonkeys-imageio-jpeg-3.4.1.jar}}
If it isn't a JPEG, then read the file into a {{BufferedImage}} and use
{{PDPixelMap(PDDocument doc, BufferedImage bi)}}.
It might still not work. As I've told you before, PDFBox is for java. If you
really want to use C#, you should license itext, and would probably be done
within a day or two.
> how the visual representation of the signature is achieved
> ------------------------------------------------------------
>
> Key: PDFBOX-4556
> URL: https://issues.apache.org/jira/browse/PDFBOX-4556
> Project: PDFBox
> Issue Type: Wish
> Components: .NET
> Affects Versions: 1.8.16
> Reporter: bal
> Priority: Major
> Attachments: image error stacktrace.txt, npe at adappearence
> dictionary.txt, pdfAnnotation.pdf, visibleSignature.pdf
>
>
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