jian li,

jian li wrote
> is there any way to diff visible and invisible text in IText?

Which text do you mean? Do you mean text in chunks or paragraphs you create
to add to some document? Do you mean the text in some document attributes
(e.g. author, ...)? Do you mean text extracted by the parser package? Do you
mean text in strings found as direct objects anywhere in a PDF?

What do you mean by visible/invisible? Do you mean whether text in
properties is displayed on some document property dialog in some PDF viewer?
Do you mean whether or not text in the page content is off-screen? Or hidden
below other content? Or the same color as the content below? Or drawn
invisibly? Or clipped by some clipping path?

Please explain what you need and what you have tried so far.

Regards,   Michael



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