Re: [R] Reducing the size of pdf graphics files produced with R
On Wed, May 23, 2007 at 10:13:22AM -0700, Waichler, Scott R wrote: Scott Scott Waichler, Senior Research Scientist Pacific Northwest National Laboratory MSIN K9-36 P.O. Box 999 Richland, WA 99352USA 509-372-4423 (voice) 509-372-6089 (fax) [EMAIL PROTECTED] http://hydrology.pnl.gov --- -Original Message- From: Joerg van den Hoff [mailto:[EMAIL PROTECTED] Sent: Wednesday, May 23, 2007 9:25 AM To: Waichler, Scott R Cc: r-help@stat.math.ethz.ch; [EMAIL PROTECTED] Subject: Re: [R] Reducing the size of pdf graphics files produced with R On Wed, May 23, 2007 at 07:24:04AM -0700, Waichler, Scott R wrote: as you are using MacOS X, you'll have ghostscript installed anyway. so try in R `dev2bitmap' with `type =pdfwrite'. I believe `gs' _does_ include compression. a quick test showed at least a reduction by about a factor of 2 relative to `pdf()'. probably one can fiddle with the ghostscript settings (cf. e.g. `Ps2pdf.htm' in the ghostscipt docs: you can adjust the resolution for images in the pdf file) to improve this, so as a last resort you could indeed export the graphics as postscript and do the conversion to `pdf' by adjusting the `ps2pdf' switches. but even with the default settings the pdf produced via dev2bitmap/ghostscript is the better solution. apart from file size I by and then ran into problems when converting `pdf()' output to postscript later on, for instance. Can you give an example of dev2bitmap usage? I tried using it in `dev2bitmap(file = rf.pdf, type = pdfwrite)' copies the current device to the pdf-file `rf.pdf', i.e. you should have plotted something on the screen prior to using this (the manpage tells you so much...). no `dev.off' is necessary in this case. in order to plot directly into the pdffile, you can use `bitmap' instead of `dev2bitmap', i.e. use either: plot(1:10) dev2bitmap(file = rf1.pdf, type = pdfwrite) or: bitmap(file = rf2.pdf, type = pdfwrite) plot(1:10) dev.off() both should produce the desired output file (at least after including the correct `width' and `height' settings). I tried the second method, using width=8.5, height=11, but the margins in the output were bad, as if it assumed a4 paper or something. I tried inserting paper=special and paper=letter in the bitmap call, but both caused errors. Also, the plot was in grayscale instead of color. Scott Waichler if you look at the source code of `bitmap' you'll see that it essentially constructs a `gs' command (the string `cmd') which is fed by the output of the R `postscript' device via a pipe (the manpage of `bitmap' tells the same). so I presume if you don't get colour or seem to have wrong page size this has nothing to do with R, but you need to check your ghostscript installation. only guessing, though. joerg __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Reducing the size of pdf graphics files produced with R
Hi again, Many of you have suggested other means than pdf device and/or conversion/compression of pdf outside of R. I ran some tests on a small, a medium-size and a large figure. Here I summarize the results, which depend very much on the original graphics file. Please note that I wish to retain a vector-based graphic file. You'll find at the end of this message the R program used to produce the graphics files. Starting with a small size graphic file: in order, these were produced by 1) postscript device 2) pdf device 3) bitmap device (pdf output) 4) dev2bitmap, pdf output, from a quartz window 5) quartz device saved to pdf via command quarts.save 6) quartz device saved to pdf via save menu in R gui -rw-r--r-- 1 chabotd chabotd243446 May 23 21:00 test_ps_from_R.ps -rw-r--r-- 1 chabotd chabotd572513 May 23 21:00 test_pdf_from_R.pdf -rw-r--r-- 1 chabotd chabotd600106 May 24 09:21 test_pdf_bitmapR.pdf -rw-r--r-- 1 chabotd chabotd600050 May 24 09:22 test_dev2bitmap.pdf -rw-r--r-- 1 chabotd chabotd 1657446 May 23 21:00 test_pdf_from_quartz.save.pdf -rw-r--r-- 1 chabotd chabotd572634 May 23 21:01 test_pdf_from_quartz.menu.pdf These show how test_pdf_from_R.pdf can be shrunk outside of R 1) the command pdftk 2) opening the pdf in any Mac OS X pdf viewer and doing print to compressed pdf -rw-r--r-- 1 chabotd chabotd 68742 May 24 09:25 test_pdf_pdftk.pdf -rw-r--r-- 1 chabotd chabotd100660 May 23 21:16 test_pdf_print_to_comppdf.pdf Finally, these show 3 conversions from postscript to pdf outside of R 1) command ps2pdf 2) command epstopdf 3) command pstopdf -rw-r--r-- 1 chabotd chabotd566626 May 23 21:12 test_ps_ps2pdf.pdf -rw-r--r-- 1 chabotd chabotd566587 May 24 10:21 test_ps_epstopdf.pdf -rw-r--r-- 1 chabotd chabotd 1939788 May 24 10:20 test_ps_pstopdf.pdf For this first example, all pdf produced directly within R were of similar size, except one (quartz.save) that was 3x larger. Producing a postscript file and transforming it into pdf resulted in no significant saving. However pdf output from R can be shrunk (here to 12% of original size) with pdftk. So far I found no adverse effect of this shrinking. I did the same with a larger graphic, this example came from Dave Watson. Using the same blocks as above: Produced with R: -rw-r--r-- 1 chabotd chabotd854320 May 24 09:08 mauna_ps_from_R.eps -rw-r--r-- 1 chabotd chabotd 1000504 May 24 09:08 mauna_pdf_from_R.pdf -rw-r--r-- 1 chabotd chabotd 96737 May 24 09:08 mauna_pdf_bitmapR.pdf -rw-r--r-- 1 chabotd chabotd 97236 May 24 09:17 mauna_dev2bitmap.pdf -rw-r--r-- 1 chabotd chabotd468195 May 24 09:08 mauna_pdf_from_quartz.save.pdf -rw-r--r-- 1 chabotd chabotd999853 May 24 09:09 mauna_pdf_from_quartz.menu.pdf PS to pdf outside of R -rw-r--r-- 1 chabotd chabotd 95024 May 24 09:11 mauna_ps_ps2pdf.pdf -rw-r--r-- 1 chabotd chabotd603021 May 24 10:40 mauna_ps_pstopdf.pdf -rw-r--r-- 1 chabotd chabotd 95015 May 24 10:40 mauna_ps_epstopdf.pdf pdf transformation outside of R -rw-r--r-- 1 chabotd chabotd104487 May 24 09:12 mauna_pdf_pdftk.pdf -rw-r--r-- 1 chabotd chabotd134663 May 24 09:23 mauna_print_to_comppdf.pdf For this example, different methods of producing pdf within R had very different file sizes. The two methods based on quartz performed in reverse order compare to the previous example. Overall, using bitmap device or postscript-transformed-to-pdf outside of R produced files about 10% the size of the file produced by pdf device. But the latter could be shrunk almost as much using pdftk. Finally, a larger-size example: Produced with R: -rw-r--r-- 1 chabotd chabotd 1426330 May 23 20:54 fig_ps_from_R.ps -rw-r--r-- 1 chabotd chabotd 3384788 May 23 20:54 fig_pdf_from_R.pdf -rw-r--r-- 1 chabotd chabotd 3494689 May 24 09:03 fig_pdf_bitmapR.pdf -rw-r--r-- 1 chabotd chabotd 3494689 May 24 10:46 fig_dev2bitmap.pdf -rw-r--r-- 1 chabotd chabotd 3384832 May 23 20:54 fig_pdf_from_quartz.menu.pdf -rw-r--r-- 1 chabotd chabotd 9583552 May 23 20:52 fig_pdf_from_quartz.save.pdf PS to pdf outside of R -rw-r--r-- 1 chabotd chabotd 3356223 May 23 21:12 fig_ps_ps2pdf.pdf -rw-r--r-- 1 chabotd chabotd 11397461 May 23 23:51 fig_ps_pstopdf.pdf -rw-r--r-- 1 chabotd chabotd 3354762 May 23 23:55 fig_ps_epstopdf.pdf pdf transformation outside of R -rw-r--r-- 1 chabotd chabotd379307 May 23 22:31 fig_pdf_comptk.pdf -rw-r--r-- 1 chabotd chabotd520509 May 24 00:19 fig_pdf_print_to_comppdf.pdf This time, as in the first example, there was little benefit going the bitmap device or ps to pdf route. Only shrinking the pdf with pdftk was effective. So examples with a lot of objects on the plot do not seem to benefit from postscript use, but one example with few objects (but objects that
Re: [R] Reducing the size of pdf graphics files produced with R
as you are using MacOS X, you'll have ghostscript installed anyway. so try in R `dev2bitmap' with `type =pdfwrite'. I believe `gs' _does_ include compression. a quick test showed at least a reduction by about a factor of 2 relative to `pdf()'. probably one can fiddle with the ghostscript settings (cf. e.g. `Ps2pdf.htm' in the ghostscipt docs: you can adjust the resolution for images in the pdf file) to improve this, so as a last resort you could indeed export the graphics as postscript and do the conversion to `pdf' by adjusting the `ps2pdf' switches. but even with the default settings the pdf produced via dev2bitmap/ghostscript is the better solution. apart from file size I by and then ran into problems when converting `pdf()' output to postscript later on, for instance. Can you give an example of dev2bitmap usage? I tried using it in place of a pdf() statement. An X11 window opened and my figure flew by, but I didn't get the file output. I also used dev2bitmap after opening a pdf() and just before the dev.off() statement, since the help says it works on the current device, but again no written output. What am I doing wrong? I tried: dev2bitmap(file = plotfile2, type=pdfwrite, width=8.5, height=11, pointsize=12) print(myplot()) dev.off() and pdf(file = plotfile, paper=letter, width=8.5, height=11, pointsize=12) print(myplot()) dev2bitmap(file = plotfile2, type=pdfwrite, width=8.5, height=11, pointsize=12) dev.off() Thanks, Scott Waichler scott.waichler _at_ pnl.gov __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Reducing the size of pdf graphics files produced with R
On Wed, May 23, 2007 at 07:24:04AM -0700, Waichler, Scott R wrote: as you are using MacOS X, you'll have ghostscript installed anyway. so try in R `dev2bitmap' with `type =pdfwrite'. I believe `gs' _does_ include compression. a quick test showed at least a reduction by about a factor of 2 relative to `pdf()'. probably one can fiddle with the ghostscript settings (cf. e.g. `Ps2pdf.htm' in the ghostscipt docs: you can adjust the resolution for images in the pdf file) to improve this, so as a last resort you could indeed export the graphics as postscript and do the conversion to `pdf' by adjusting the `ps2pdf' switches. but even with the default settings the pdf produced via dev2bitmap/ghostscript is the better solution. apart from file size I by and then ran into problems when converting `pdf()' output to postscript later on, for instance. Can you give an example of dev2bitmap usage? I tried using it in place of a pdf() statement. An X11 window opened and my figure flew by, but I didn't get the file output. I also used dev2bitmap after opening a pdf() and just before the dev.off() statement, since the help says it works on the current device, but again no written output. What am I doing wrong? I tried: dev2bitmap(file = plotfile2, type=pdfwrite, width=8.5, height=11, pointsize=12) print(myplot()) dev.off() and pdf(file = plotfile, paper=letter, width=8.5, height=11, pointsize=12) print(myplot()) dev2bitmap(file = plotfile2, type=pdfwrite, width=8.5, height=11, pointsize=12) dev.off() Thanks, Scott Waichler scott.waichler _at_ pnl.gov `dev2bitmap(file = rf.pdf, type = pdfwrite)' copies the current device to the pdf-file `rf.pdf', i.e. you should have plotted something on the screen prior to using this (the manpage tells you so much...). no `dev.off' is necessary in this case. in order to plot directly into the pdffile, you can use `bitmap' instead of `dev2bitmap', i.e. use either: plot(1:10) dev2bitmap(file = rf1.pdf, type = pdfwrite) or: bitmap(file = rf2.pdf, type = pdfwrite) plot(1:10) dev.off() both should produce the desired output file (at least after including the correct `width' and `height' settings). joerg __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Reducing the size of pdf graphics files produced with R
Scott Scott Waichler, Senior Research Scientist Pacific Northwest National Laboratory MSIN K9-36 P.O. Box 999 Richland, WA 99352USA 509-372-4423 (voice) 509-372-6089 (fax) [EMAIL PROTECTED] http://hydrology.pnl.gov --- -Original Message- From: Joerg van den Hoff [mailto:[EMAIL PROTECTED] Sent: Wednesday, May 23, 2007 9:25 AM To: Waichler, Scott R Cc: r-help@stat.math.ethz.ch; [EMAIL PROTECTED] Subject: Re: [R] Reducing the size of pdf graphics files produced with R On Wed, May 23, 2007 at 07:24:04AM -0700, Waichler, Scott R wrote: as you are using MacOS X, you'll have ghostscript installed anyway. so try in R `dev2bitmap' with `type =pdfwrite'. I believe `gs' _does_ include compression. a quick test showed at least a reduction by about a factor of 2 relative to `pdf()'. probably one can fiddle with the ghostscript settings (cf. e.g. `Ps2pdf.htm' in the ghostscipt docs: you can adjust the resolution for images in the pdf file) to improve this, so as a last resort you could indeed export the graphics as postscript and do the conversion to `pdf' by adjusting the `ps2pdf' switches. but even with the default settings the pdf produced via dev2bitmap/ghostscript is the better solution. apart from file size I by and then ran into problems when converting `pdf()' output to postscript later on, for instance. Can you give an example of dev2bitmap usage? I tried using it in `dev2bitmap(file = rf.pdf, type = pdfwrite)' copies the current device to the pdf-file `rf.pdf', i.e. you should have plotted something on the screen prior to using this (the manpage tells you so much...). no `dev.off' is necessary in this case. in order to plot directly into the pdffile, you can use `bitmap' instead of `dev2bitmap', i.e. use either: plot(1:10) dev2bitmap(file = rf1.pdf, type = pdfwrite) or: bitmap(file = rf2.pdf, type = pdfwrite) plot(1:10) dev.off() both should produce the desired output file (at least after including the correct `width' and `height' settings). I tried the second method, using width=8.5, height=11, but the margins in the output were bad, as if it assumed a4 paper or something. I tried inserting paper=special and paper=letter in the bitmap call, but both caused errors. Also, the plot was in grayscale instead of color. Scott Waichler __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Reducing the size of pdf graphics files produced with R
Hi, Without trying to print 100 points (see http:// finzi.psych.upenn.edu/R/Rhelp02a/archive/42105.html), I often print maps for which I do not want to loose too much of coastline detail, and/or plots with 1000-5000 points (yes, some are on top of each other, but using transparency (i.e. rgb colors with alpha information) this actually comes through as useful information. But the files are large (not as large as in the thread above of course, 800 KB to about 2 MB), especially when included in a LaTeX document by the dozen. Acrobat (not the reader, the full program) has an option reduce file size. I don't know what it does, but it shrinks most of my plots to about 30% or original size, and I cannot detect any loss of detail even when zooming several times. But it is a pain to do this with Acrobat when you generate many plots... And you need to buy Acrobat. Is this something the pdf device could do in a future version? I tried the million points example from the thread above and the 55 MB file was reduced to 6.9 MB, an even better shrinking I see on my usual plots. Denis Chabot __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Reducing the size of pdf graphics files produced with R
From the help page 'pdf' writes uncompressed PDF. It is primarily intended for producing PDF graphics for inclusion in other documents, and PDF-includers such as 'pdftex' are usually able to handle compression. If you are able to contribute a stream compressor, R will produce smaller plots. Otherwise it is unlikely to happen (and it any case would be a smaller contribution than that of the author of pdf(), who is quite happy with external compressors). Acrobat does other things (not all of which it tells you about), but compression is the main advantage. On Tue, 22 May 2007, Chabot Denis wrote: Hi, Without trying to print 100 points (see http:// finzi.psych.upenn.edu/R/Rhelp02a/archive/42105.html), I often print maps for which I do not want to loose too much of coastline detail, and/or plots with 1000-5000 points (yes, some are on top of each other, but using transparency (i.e. rgb colors with alpha information) this actually comes through as useful information. But the files are large (not as large as in the thread above of course, 800 KB to about 2 MB), especially when included in a LaTeX document by the dozen. Acrobat (not the reader, the full program) has an option reduce file size. I don't know what it does, but it shrinks most of my plots to about 30% or original size, and I cannot detect any loss of detail even when zooming several times. But it is a pain to do this with Acrobat when you generate many plots... And you need to buy Acrobat. Is this something the pdf device could do in a future version? I tried the million points example from the thread above and the 55 MB file was reduced to 6.9 MB, an even better shrinking I see on my usual plots. Denis Chabot __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Reducing the size of pdf graphics files produced with R
You need not buy Acrobat. There are two free software programs that will compress pdf files: http://www.cutepdf.com http://www.cs.wisc.edu/~ghost/ (and in particular GSView) They both allow several levels of compression. Thanks, --sundar Chabot Denis said the following on 5/22/2007 3:32 AM: Hi, Without trying to print 100 points (see http:// finzi.psych.upenn.edu/R/Rhelp02a/archive/42105.html), I often print maps for which I do not want to loose too much of coastline detail, and/or plots with 1000-5000 points (yes, some are on top of each other, but using transparency (i.e. rgb colors with alpha information) this actually comes through as useful information. But the files are large (not as large as in the thread above of course, 800 KB to about 2 MB), especially when included in a LaTeX document by the dozen. Acrobat (not the reader, the full program) has an option reduce file size. I don't know what it does, but it shrinks most of my plots to about 30% or original size, and I cannot detect any loss of detail even when zooming several times. But it is a pain to do this with Acrobat when you generate many plots... And you need to buy Acrobat. Is this something the pdf device could do in a future version? I tried the million points example from the thread above and the 55 MB file was reduced to 6.9 MB, an even better shrinking I see on my usual plots. Denis Chabot __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Reducing the size of pdf graphics files produced with R
Thank you Prof. Ripley. Believe me, I do not have the skills to contribute such a thing as a stream compressor and I DO appreciate the work and usefulness of the pdf device as it is. I do most of my plots with pdf device, the rest with quartz (especially when I'm not sure I'll want to save a plot) and (rarely) png when the pdf output is too large or for compatibility with microsoft applications. I find the statement you took from the help page promising: I often include these large plots into LaTeX, so I'll investigate what form of compression pdftex can do. Sincerely, Denis Le 07-05-22 à 12:47, Prof Brian Ripley a écrit : From the help page 'pdf' writes uncompressed PDF. It is primarily intended for producing PDF graphics for inclusion in other documents, and PDF-includers such as 'pdftex' are usually able to handle compression. If you are able to contribute a stream compressor, R will produce smaller plots. Otherwise it is unlikely to happen (and it any case would be a smaller contribution than that of the author of pdf(), who is quite happy with external compressors). Acrobat does other things (not all of which it tells you about), but compression is the main advantage. On Tue, 22 May 2007, Chabot Denis wrote: Hi, Without trying to print 100 points (see http:// finzi.psych.upenn.edu/R/Rhelp02a/archive/42105.html), I often print maps for which I do not want to loose too much of coastline detail, and/or plots with 1000-5000 points (yes, some are on top of each other, but using transparency (i.e. rgb colors with alpha information) this actually comes through as useful information. But the files are large (not as large as in the thread above of course, 800 KB to about 2 MB), especially when included in a LaTeX document by the dozen. Acrobat (not the reader, the full program) has an option reduce file size. I don't know what it does, but it shrinks most of my plots to about 30% or original size, and I cannot detect any loss of detail even when zooming several times. But it is a pain to do this with Acrobat when you generate many plots... And you need to buy Acrobat. Is this something the pdf device could do in a future version? I tried the million points example from the thread above and the 55 MB file was reduced to 6.9 MB, an even better shrinking I see on my usual plots. Denis Chabot __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Reducing the size of pdf graphics files produced with R
Thank you Sundar, Do plots being so reduced remain object based (i.e. not bitmaps)? Denis Le 07-05-22 à 13:19, Sundar Dorai-Raj a écrit : You need not buy Acrobat. There are two free software programs that will compress pdf files: http://www.cutepdf.com http://www.cs.wisc.edu/~ghost/ (and in particular GSView) They both allow several levels of compression. Thanks, --sundar Chabot Denis said the following on 5/22/2007 3:32 AM: Hi, Without trying to print 100 points (see http:// finzi.psych.upenn.edu/R/Rhelp02a/archive/42105.html), I often print maps for which I do not want to loose too much of coastline detail, and/or plots with 1000-5000 points (yes, some are on top of each other, but using transparency (i.e. rgb colors with alpha information) this actually comes through as useful information. But the files are large (not as large as in the thread above of course, 800 KB to about 2 MB), especially when included in a LaTeX document by the dozen. Acrobat (not the reader, the full program) has an option reduce file size. I don't know what it does, but it shrinks most of my plots to about 30% or original size, and I cannot detect any loss of detail even when zooming several times. But it is a pain to do this with Acrobat when you generate many plots... And you need to buy Acrobat. Is this something the pdf device could do in a future version? I tried the million points example from the thread above and the 55 MB file was reduced to 6.9 MB, an even better shrinking I see on my usual plots. Denis Chabot __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Reducing the size of pdf graphics files produced with R
On Tue, May 22, 2007 at 01:06:06PM -0400, Chabot Denis wrote: Thank you Prof. Ripley. Believe me, I do not have the skills to contribute such a thing as a stream compressor and I DO appreciate the work and usefulness of the pdf device as it is. I do most of my plots with pdf device, the rest with quartz (especially when I'm not sure I'll want to save a plot) and (rarely) png when the pdf output is too large or for compatibility with microsoft applications. I find the statement you took from the help page promising: I often include these large plots into LaTeX, so I'll investigate what form of compression pdftex can do. Sincerely, Denis Le 07-05-22 à 12:47, Prof Brian Ripley a écrit : From the help page 'pdf' writes uncompressed PDF. It is primarily intended for producing PDF graphics for inclusion in other documents, and PDF-includers such as 'pdftex' are usually able to handle compression. If you are able to contribute a stream compressor, R will produce smaller plots. Otherwise it is unlikely to happen (and it any case would be a smaller contribution than that of the author of pdf(), who is quite happy with external compressors). Acrobat does other things (not all of which it tells you about), but compression is the main advantage. On Tue, 22 May 2007, Chabot Denis wrote: Hi, Without trying to print 100 points (see http:// finzi.psych.upenn.edu/R/Rhelp02a/archive/42105.html), I often print maps for which I do not want to loose too much of coastline detail, and/or plots with 1000-5000 points (yes, some are on top of each other, but using transparency (i.e. rgb colors with alpha information) this actually comes through as useful information. But the files are large (not as large as in the thread above of course, 800 KB to about 2 MB), especially when included in a LaTeX document by the dozen. Acrobat (not the reader, the full program) has an option reduce file size. I don't know what it does, but it shrinks most of my plots to about 30% or original size, and I cannot detect any loss of detail even when zooming several times. But it is a pain to do this with Acrobat when you generate many plots... And you need to buy Acrobat. Is this something the pdf device could do in a future version? I tried the million points example from the thread above and the 55 MB file was reduced to 6.9 MB, an even better shrinking I see on my usual plots. Denis Chabot __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting- guide.html and provide commented, minimal, self-contained, reproducible code. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UKFax: +44 1865 272595 __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. as an attempt to suggest something more helpful than do write the compressor yourself if you have a problem with pdf(): as you are using MacOS X, you'll have ghostscript installed anyway. so try in R `dev2bitmap' with `type =pdfwrite'. I believe `gs' _does_ include compression. a quick test showed at least a reduction by about a factor of 2 relative to `pdf()'. probably one can fiddle with the ghostscript settings (cf. e.g. `Ps2pdf.htm' in the ghostscipt docs: you can adjust the resolution for images in the pdf file) to improve this, so as a last resort you could indeed export the graphics as postscript and do the conversion to `pdf' by adjusting the `ps2pdf' switches. but even with the default settings the pdf produced via dev2bitmap/ghostscript is the better solution. apart from file size I by and then ran into problems when converting `pdf()' output to postscript later on, for instance. hth, joerg __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
