What does this TJ data mean?
Hello,
I am implementing a PDF parser in Objective-C (using CoreGraphics API's) that will aid in PDF search. I know that the Tj and TJ operators are used for displaying text, and that to retrieve the text information from a page I should be looking there.
The problem comes in when there are weird operands in the TJ operator. Below is one such example:
[<1C>]TJ
0.7039 0 Td
[<1D>]TJ
What does the above highlighted red text data mean, in terms of the semantic information that it contains? During parsing, the output of the above 2 operands are the characters ˝ and ˛ respectively. Am I going to have to use the font encoding provided in the Resources dictionary of the page to decipher what these characters semantically mean?
Thanks a lot,
Michael
I assume you have a copy of ISO 32000-1:2008 available, so that you are reading what is written there first before asking.
The answer is that NOT ONLY do you need to read the font encoding information for ANY TEXT EXTRACTION, but you ALSO need to read the information from any embedded fonts for the embedded encoding information. This is especially true for TrueType fonts vs. Type 1 fonts, and CID-based fonts.
And don't forget ToUnicode tables!
There is a section in ISO 32000-1 that describes the entire process of text extraction.
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