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0 pointsmehrdadn7y ago0 comments

Interesting, thank you for the explanation! I am indeed seeing a lot of Tj's and BT/ET's, but not any TJ's.

Immediately preceding the Tj's are a lot of non-text characters that don't look like anything human-readable. Immediately following them are other other commands (Td, Tf, rg, k, etc.) which are preceded by numbers. There are no CustomEncodings. So I guess this means I can't really grep anything?

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mkl7y ago

Sounds like it. The T commands are text related and rg and k are setting colour in RGB and CMYK. You may be able to figure it out by changing a colour, then looking at what is suddenly bright red or whatever you set. Or by changing the string preceding Tj. When editing, make sure you don't change the length of any objects (use space to pad) as there are hardcoded offsets in a table, usually at the end.

The PDF specification, while long, is pretty readable for this kind of thing. You can download the 1.7 version free from Adobe. Appendix A has a table of commands.

mehrdadnOP7y ago

Thanks! This was cool info.

j / k navigate · click thread line to collapse

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mkl7y ago

The PDF specification, while long, is pretty readable for this kind of thing. You can download the 1.7 version free from Adobe. Appendix A has a table of commands.

mehrdadnOP7y ago

Thanks! This was cool info.

j / k navigate · click thread line to collapse