Hi experts,
Let’s say I have a PDF file on which a few TH1s are printed out on a TCanvas. One way or the other the styling of the plot is not suitable for my purposes, so I would like to redraw it with some other styling but keeping all other information the same. What would my options be in such a case, other than eyeballing the data points and errors? Maybe ROOT can do this already, and I’m just unaware of the method…
Cheers,
Afiq
Sorry, once you plot your data into a PDF file, it’s not easy to recover the data. You will need to use some tool like WebPlotDigitizer I’m afraid.
If the changes are minor, like changing a color, you can convert the pdf into a ps and then edit the ps file. If that’s more complex than that you will need to reconstruct your histogram. Of course if you can have access to the original histogram that would be the best … 
Ain’t that the truth. But yeah, for the particular case I have in mind, I don’t have the originals.
I guess something like
somePDFPlot->ReadData();
is a bit too good to be true. I’ll check out the tricks mentioned here.
Thanks!
And other problem might be that, even if you convert the pdf into ascii, the data values you will find in the file will be some converted values in the coordinates space of the PDF file, not the value you read on the axis.
I had in mind a PDF file generated by ROOT and read back by ROOT, so I was assuming that ROOT knows the format. But ok seeing that such a facility doesn’t exist it’s a moot point…
May be post your pdf file and tell what kind of mods you needs.
PDF is output only there is no facility to read them back in ROOT.
To read images back you better store them in a ROOT file or in a .C file.
Sorry for the late reply; laptop decided to take a vacation…
Anyway, example PDF here. Let’s say I want the colors changed, marker size, the axes label sizes and maybe tick count, canvas margins to accommodate the larger labels, and the legend looks rather bad too… in other words I want a new plot of the same histogram.
I’m aware that in cases like these it’s much easier to save it also as a .C or .root file - this is indeed what I do now - but what I have in mind are plots that were made long before I had any form of backup practices, so yeah, their PDF files are all I have. Is there no way to prettify them? 
emerg_eta.pdf (14.6 KB)
The part with the data is encoded in the binary output just after line 355 in your file.
It is not easy to get the value back from there. As you have only 6 points in that plot I guess
you can recreate easily the data just looking at the plot. But that’s valid if you
have a small amount of such plots. For more plot you will need to automate the process. A tool like qpdf will allow to generate an ascii version of the file but then you have to retrieve in the file where the data are… They are converted into the pdf coordinates (integer) so that’s not easy to retrieve. Attached is the file in ascii converted using qdf.
out.pdf (33.1 KB)
First, thanks for introducing me to a new tool I was unaware about: qpdf.
Second, what was the command you used to get the file “just after line 355” for the data points? I tried both opening the original file with emacs and also qpdf --qdf file - and both gave me something gibberish (although the latter looked much better).
Some plots I needed to update do have a lot of points, and drawn with a few “same” so eyeballing them ain’t gonna work, and as long as I can have a systematic way to read back the data I can deal with remaking this histograms as painful as that is, so if I can get some pointers on say:
1- where the axes and points start and end
2- how the coordinate system works (has to be linear translation… right?)
…then I can go on a sidequest to recover these guys (and making triple sure I won’t have to go through such horrors again).
The command i used to convert the binary is:
qpdf --qdf --object-streams=disable emerg_eta.pdf out.pdf
But as I said the values are then integer you need to convert back. And to convert back you would need to know the original user coordinates system, and this is lost in the pdf…
The the ascii file the part drawing the error bars is:
stream
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endstream
The deeper the discussion goes in the less I think this is feasible. The part with error bars is particularly despairing; I see nothing about the line that indicates to me it’s about the error bars. Was hoping for there to be a kind of identifier that lets me grab the axes and such, then a procedure for automatizing it at least becomes clear.
I guess it’s time to check out WebPlotDigitizer.
Yes, i told you, that’s not the right way … I am not sure you will be able to really change the geometry. Changing colour, line width title place is fine … but for the rest that’s not an easy task.
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