Torben at 21:03, 30 October 2024

2024-10-30T21:03:15Z

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[[Category:Software]]
===Required Software===
2019: New powerful tool: [https://community.coherentpdf.com/ Coherent PDF]

====Linux====
sudo apt-get install pdftk
====Windows====
[http://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/ PDFtk]

===Join several files===
pdftk in1.pdf in2.pdf cat output out.pdf
# or using handles
pdftk A=in1.pdf B=in2.pdf cat A B output out.pdf
# or using wildcards
pdftk *.pdf cat output out.pdf
#
# Remove 'page 13' from in1.pdf to create out1.pdf
pdftk in1.pdf cat 1-12 14-end output out.pdf
# or
pdftk A=in1.pdf cat A1-12 A14-end output out1.pdf
#
# join parts of several files
pdftk A=file1.pdf B=file2.pdf C=file3.pdf cat A B2-end C1-23 output out.pdf

===extract and convert page to image===
gs -dSAFER -r600 -sDEVICE=pngalpha -dFirstPage=1 -dLastPage=1 -o tmp/title-en.png tmp/hpmor.pdf
convert -density 150 tmp/title-en.png -resize 1186x1186\> -quality 75 tmp/title-en.jpg
# Here ghostscript instead of imagemagick used, since imagemagick throw this error:
# convert -density 150 tmp/hpmor.pdf[0] -quality 75 tmp/title-en.jpg
# attempt to perform an operation not allowed by the security policy

===extract page range===
====via PDFtk(Windows)====
@echo off
set pdftk=C:\Users\torben\Progs\PortableApps\PDFTKBuilderPortable\App\pdftkbuilder\pdftk.exe
set start=12
set end=40
for %%F in (input\*.pdf) do (
echo "%%~nF"
%pdftk% "%%F" cat %start%-%end% output "output\%%~nF-cat-pdftk.pdf"
)
====via GhostScript (Windows) + image compression====
@echo off
set gs=C:\Users\torben\Progs\PortableApps\CommonFiles\Ghostscript\bin\gswin32c.exe
REM output image quality is reduced to 300 dpi via -dPDFSETTINGS=\printer for 150 dpi use \ebook, for 75 dpi use \screen
set start=12
set end=40
for %%F in (input\*.pdf) do (
echo "%%~nF"
%gs% ^
-o "output\%%~nF-cat-gs.pdf" ^
-sDEVICE=pdfwrite ^
-dFirstPage=%start% -dLastPage=%end% ^
-dCompatibilityLevel=1.7 ^
-dPDFSETTINGS=/printer ^
-dAutoRotatePages=/None ^
-dNOPAUSE -dBATCH ^
-f "%%F"
)

===Crop white borders===
(useful for reading a book on a small netbook/laptop screen)

====Linux====
quick and dirty:
pdfcrop file.pdf file-crop.pdf

better, since preserves links and generates smaller filesize: Use this script [http://tex.stackexchange.com/questions/42236/pdfcrop-generates-larger-file pdfcrop.sh] or the modified version below [[#pdfcrop2.sh|pdfcrop2.sh]]

# requires pdftk
pdfcrop2.sh file.pdf file-crop.pdf

====Windows====
use [[#pdfcrop.bat|pdfcrop.bat]]

===Render two or more pages onto one page ===
# requires pdftk
sudo apt-get install pdfjam # brings pdfnup

pdfnup AS_Chapter1.pdf

===pdf shrinking and protection-removal using Ghostscript===
Shrinks file size and removes protection, '''output -o comes first!!!'''
gswin64c.exe ^
-o "file-shrink.pdf" ^
-sDEVICE=pdfwrite ^
-dCompatibilityLevel=1.7 ^
-dPDFSETTINGS=/printer ^
-dAutoRotatePages=/None ^
-dNOPAUSE -dBATCH ^
-f "file.pdf"
( Windows: gswin64c.exe and ^ ; Linux: gs and \ )

Further parametes
Converting Bitmaps to 300dpi
-dPDFSETTINGS=/printer
Converting Bitmaps to 150dpi
-dPDFSETTINGS=/ebook
Converting Bitmaps to 75dpi
-dPDFSETTINGS=/screen
Page range
-dFirstPage=100 -dLastPage=123

===Vector text on Raster image===
Do not use Inkscape when working with colorful images like pictures, since internally it stores all raster images as png, not as jpg when exporting to pdf. Better use:
# Gimp to optimize file
#* crop borders
#* scale image
#* set dpi via Image -> Scale Image -> X+Y Resolution (300px/inch is fine for printing)
#* set image->mode->grayscale if suitable
#* export in wanted quality ( e.g. 85% for jpg or image->mode->indexed for png)
# LibreOffice
#* import image, preferable as link, since than you can still modify it afterwards using Gimp
#* place text or drawings
#* File-> export as pdf
#* you might choose "Lossless compression" if already done by Gimp
#* no need for "reduce image resolution" if already done by Gimp

===Color to Greyscale===
[http://us.generation-nt.com/answer/converting-pdf-grayscale-help-200017171.html]
gs -sOutputFile=grayscale.pdf -sDEVICE=pdfwrite
-sColorConversionStrategy=Gray -dProcessColorModel=/DeviceGray
-dCompatibilityLevel=1.4 -dNOPAUSE -dBATCH c-color.pdf < /dev/null

===Appendix Scripts===
====pdfcrop.bat====
requires [http://www.ghostscript.com/download/gsdnld.html GhostScript] and [http://unxutils.sourceforge.net sed] (included in [http://unxutils.sourceforge.net UnixUtils for Windows])
@echo off
for %%F in (input\*.pdf) do (
echo "%%~nF"
echo uncompressing
REM using pdtk to uncompress
pdftk "%%F" output uncompressed.pdf uncompress

echo adding Boxes
REM sed from unix utils package
REM calc via mm2pt.xlsx
sed -e "s/$\(Crop\|Media$Box\).*/\1 [55.0 85.0 413.0 590.0]/g" uncompressed.pdf > uncompressed2.pdf
del uncompressed.pdf

REM using ghostscript to trim
echo compressing
e:\win\progs\gs9.21\bin\gswin64c.exe ^
-o "output\%%~nF-crop.pdf" ^
-sDEVICE=pdfwrite ^
-dCompatibilityLevel=1.7 ^
-dAutoRotatePages=/None ^
-dNOPAUSE -dBATCH ^
-f "uncompressed2.pdf"
del uncompressed2.pdf
)

====pdfcrop2.sh====
#!/bin/bash
# from http://tex.stackexchange.com/questions/42236/pdfcrop-generates-larger-file

function usage () {
echo "Usage: `basename $0` [Options] <input.pdf> [<output.pdf>]"
echo
echo " * Removes white margins from each page in the file. (Default operation)"
echo " * Trims page edges by given amounts. (Alternative operation)"
echo
echo "If only <input.pdf> is given, it is overwritten with the cropped output."
echo
echo "Options:"
echo
echo " -m \"<left> [<top> [<right> <bottom>]]\""
echo " adds extra margins in default operation mode. Unit is bp. A single number"
echo " is used for all margins, two numbers \"<left> <top>\" are applied to the"
echo " right and bottom margins alike."
echo
echo " -t \"<left> [<top> [<right> <bottom>]]\""
echo " trims outer page edges by the given amounts. Unit is bp. A single number"
echo " is used for all trims, two numbers \"<left> <top>\" are applied to the"
echo " right and bottom trims alike."
echo
echo " -hires"
echo " %%HiResBoundingBox is used in default operation mode."
echo
echo " -help"
echo " prints this message."
}

c=0
mar=(0 0 0 0); tri=(0 0 0 0)
bbtype=BoundingBox

while getopts m:t:h: opt
do
case $opt
in
m)
eval mar=($OPTARG)
[[ -z "${mar[1]}" ]] && mar[1]=${mar[0]}
[[ -z "${mar[2]}" || -z "${mar[3]}" ]] && mar[2]=${mar[0]} && mar[3]=${mar[1]}
c=0
;;
t)
eval tri=($OPTARG)
[[ -z "${tri[1]}" ]] && tri[1]=${tri[0]}
[[ -z "${tri[2]}" || -z "${tri[3]}" ]] && tri[2]=${tri[0]} && tri[3]=${tri[1]}
c=1
;;
h)
if [[ "$OPTARG" == "ires" ]]
then
bbtype=HiResBoundingBox
else
usage 1>&2; exit 0
fi
;;
\?)
usage 1>&2; exit 1
;;
esac
done
shift $((OPTIND-1))

[[ -z "$1" ]] && echo "`basename $0`: missing filename" 1>&2 && usage 1>&2 && exit 1
input=$1;output=$1;shift;
[[ -n "$1" ]] && output=$1 && shift;

# by TM
if [ $input == $output ] ; then
output="`basename $output`" # remove dirs
output="${output%\.*}" # remove ext .pdf & .PDF
output="$output-crop.pdf"
fi

echo "$input -> $output"

(
[[ "$c" -eq 0 ]] && gs -dNOPAUSE -q -dBATCH -sDEVICE=bbox "$input" 2>&1 | grep "%%$bbtype"
pdftk "$input" output - uncompress
) | perl -w -n -s -e '
BEGIN {@m=split /\s+/, $mar; @t=split /\s+/, $tri;}
if (/BoundingBox:\s+([\d\.\s]+\d)/) { push @bbox, $1; next;}
elsif (/\/MediaBox\s+\[([\d\.\s]+\d)\]/) { @mb=split /\s+/, $1; next; }
elsif (/pdftk_PageNum\s+(\d+)/) {
$p=$1-1;
if($c){
$mb[0]+=$t[0];$mb[1]+=$t[1];$mb[2]-=$t[2];$mb[3]-=$t[3];
print "/MediaBox [", join(" ", @mb), "]\n";
} else {
@bb=split /\s+/, $bbox[$p];
$bb[0]+=$mb[0];$bb[1]+=$mb[1];$bb[2]+=$mb[0];$bb[3]+=$mb[1];
$bb[0]-=$m[0];$bb[1]-=$m[1];$bb[2]+=$m[2];$bb[3]+=$m[3];
print "/MediaBox [", join(" ", @bb), "]\n";
}
}
print;
' -- -mar="${mar[*]}" -tri="${tri[*]}" -c=$c | pdftk - output "$output" compress

Modifying PDFs - Revision history

Torben at 21:03, 30 October 2024