🚀 go-pugleaf

I'd rather use a PostScript interpreter to do this. Ghostscript is a good choice, and look into the pstoascii script that comes with ghostscript how to do things like that.

Helge

PostScript itself is a programming language. Although there are operators to express text, vector graphics, and raster images, most PostScript streams provide procedures with these functions embedded and as such, you cannot actually determine such data by simply scanning the PostScript file. You need to fully interpret the PostScript file or add procedures to such a PostScript file to isolate such text and graphics data when the PostScript program is run.

- Dov

Thank you very much!This is my first to deal with postscript file,I still have some question. At first,I open the postscript file as txt file,so, I intend to scan the txt file to extract text and graphics information according with the rules of postscript language, but I'm not sure that it can work.You say that postscript streams provide procedures with these function, could you talk about it detail? And is my thought about scanning the txt file according with ps's rule right?

To Helge:Thank you very much!I also want to know ghostscript how to do these things, are there any files to provide the ghostscript's internal method and principle?

First of all, PostScript is not a "text" file. It can and often does contain binary data. Since PostScript streams often contain nested procedures, unless you process the procedure definitions and can "execute" them, you cannot simply "scan" a file to get what you want. No, I can't talk about this in detail since it is quite complex. But Adobe does have the PostScript Language Reference Manual on-line for download at <http://www.adobe.com/devnet/postscript/pdfs/PLRM.pdf>. Look that over and you will have a fairly healthy respect as to the task involved.

- Dov

"Dov Isaacs" ha scritto
> First of all, PostScript is not a "text" file. It can and often does
> contain binary data. Since PostScript streams often contain
> nested procedures, unless you process the procedure definitions
> and can "execute" them, you cannot simply "scan" a file to get
> what you want. No, I can't talk about this in detail since it is quite
> complex.
> [PLRM] Look that over and you will have a fairly healthy respect
> as to the task involved.

Moreover, there can be text that is perfectly readable for an human
being but very, *very* difficult to extract as such, if it's possible at all:
if you do a "convert text to curves" in any graphics program you'd
understand what i'm talking of.
In those cases, the only way to *try* to read some text would be to
convert the PS to a raster image and pass it to an OCR.

Bye, G. 

To Dov: Thank you very much, I will read the pdf file detail!Thank you!

"Paperino" ha scritto
> if you do a "convert text to curves" in any graphics program you'd
> understand what i'm talking of.

Hmmmm... of course, "you" = "OP" :-)

Bye, G.