Op 21/12/2011 1:09, Ali Vajahat schreef:
> I have attached a pdf . If you notice on the page than you come to 
> know that there are some hidden texts above the image that we can 
> select using text selection.

What makes you think the text is above the image. The text could as well 
be covered by the image.

> I want to know what type of text is this? I want to make it visible ? How?

Use iText PDF parser. This is explained in chapter 15 (section 3).
Or: if you only want a quick look (without programming) use iText RUPS.

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