script to auto-split two scanned pages in single pages

[dingodog]

working with graphicsmagick and imagemagick (removing gm from script) (I started to write this script to automate some repetitive tasks)

assuming you have scanned two pages at one time and you want split in single pages

and your first image has name 0-000.jpg

you can split in single pages all your scans, by calculating the cropping dimensions and coordinates, by reading width and height from first image and dividing by two its width, to have the dimensions and the cropping coordinates for even and odd pages

this is my first attempt to create a splitting script, so, many thing may be enhanced

for graphicsmagick

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if [ ! -e even-odd ]; then mkdir even-odd; fi
first="`ls -1 *.jpg | head -n1`"
let "halfwidth=`gm identify -format '%w \n' "$first"`/2"
width="`gm identify -format '%w \n' "$first"`"
height="`gm identify -format '%h \n' "$first"`"
quality="$(gm identify -verbose $(ls *.jpg | head -n1) | grep Quality | cut -d: -f2)"
for FILE in *.jpg ; do gm convert -quality $quality -crop "$halfwidth"x"$height"+0+0 "$FILE" "${FILE%%.jpg}-A.jpg" ; mv `ls *.jpg | grep A` even-odd ; gm convert -quality $quality -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "${FILE%%.jpg}-B.jpg" && mv `ls *.jpg | grep B` even-odd
 done ;

for imagemagick

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if [ ! -e even-odd ]; then mkdir even-odd; fi
first="`ls -1 *.jpg | head -n1`"
let "halfwidth=` identify -format '%w \n' "$first"`/2"
width="`identify -format '%w \n' "$first"`"
height="`identify -format '%h \n' "$first"`"
quality="$(identify -verbose $(ls *.jpg | head -n1) | grep Quality | cut -d: -f2)"
for FILE in *.jpg ; do convert -quality $quality -crop "$halfwidth"x"$height"+0+0 "$FILE" "${FILE%%.jpg}-A.jpg" ; mv `ls *.jpg | grep A` even-odd ;  convert -quality $quality -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "${FILE%%.jpg}-B.jpg" && mv `ls *.jpg | grep B` even-odd
 done ;

2nd step, joining all images in a single pdf

I use sam2p and pdftk

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#!/bin/bash

directory=`pwd`

for file in $directory/*.jpg
do
   filename=${file%.jpg}
   sam2p $filename.jpg $filename.pdf
done

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pdftk *.pdf cat output out.pdf && pdftk out.pdf output fixed.pdf && mv fixed.pdf out.pdf

[L0g1cM0del]

I'm not sure how to use this. Is this something that you enter from the command line or do you have to put this somewhere in graphicsmagick/imagemagick? I didn't see a way to include it in either of the magicks displays.

Sorry, I'm still trying to learn and understand about programming things.

[dingodog]

simply, you can select all text (it is better to copy the 2nd version of script) you need to have installed graphicsmagick or imagemagick in order to use this script

working for graphicsmagick

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#!/bin/sh
if [ ! -e even-odd ]; then mkdir even-odd; fi
first="`ls -1 *.jpg | head -n1`"
let "halfwidth=`gm identify -format '%w \n' "$first"`/2"
width="`gm identify -format '%w \n' "$first"`"
height="`gm identify -format '%h \n' "$first"`"
for FILE in *.jpg ; do gm convert -crop "$halfwidth"x"$height"+0+0 "$FILE" "$FILE-A.jpg" ; mv `ls *.jpg | grep A` even-odd ; gm convert -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "$FILE-B.jpg" && mv `ls *.jpg | grep B` even-odd
done ;

working for imagick

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#!/bin/sh
if [ ! -e even-odd ]; then mkdir even-odd; fi
first="`ls -1 *.jpg | head -n1`"
let "halfwidth=` identify -format '%w \n' "$first"`/2"
width="` identify -format '%w \n' "$first"`"
height="` identify -format '%h \n' "$first"`"
for FILE in *.jpg ; do  convert -crop "$halfwidth"x"$height"+0+0 "$FILE" "$FILE-A.jpg" ; mv `ls *.jpg | grep A` even-odd ;  convert -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "$FILE-B.jpg" && mv `ls *.jpg | grep B` even-odd
done ;

then past in a new text file, saving and renaming this file as splitpages (without extension) giving permission to execute

now you can copy or move this script in a directory like /usr/bin or /usr/local/bin

cp splitpages /usr/bin

so you can invoke this script simply opening a shell in directory where you have your images scanned at two pages for image, and typing in a terminal

splitpages

this script will take automatically the width and hight of images (from first image of set), create a new directory named even-odd, split at half facing pages scans, in order to have single pages and finally will move in created directory (even-odd) adding suffixes: like A for even and B for odd, in order to order properly the images

[L0g1cM0del]

Thanks for the clarifications. I have them both installed on Windows right now, but I will try it out on linux later on. It does seem very useful. Thanks again.

[thepapermen]

Thanks for a great script. I've recently used it and it works flawlessly!

However, I've got to make one important clarification: If you see let: not found error while running it, it means that your system uses different shell to execute sh cripts and you need to explicitly call /bin/bash instead of /bin/sh.

Thanks for a great work!

[dingodog]

improved version of script (it strips the final extension from file and replace with -A.jpg and -B.jpg without reduplication)

for graphicsmagick

Code: Select all

if [ ! -e even-odd ]; then mkdir even-odd; fi
first="`ls -1 *.jpg | head -n1`"
let "halfwidth=`gm identify -format '%w \n' "$first"`/2"
width="`gm identify -format '%w \n' "$first"`"
height="`gm identify -format '%h \n' "$first"`"
quality="$(gm identify -verbose $(ls *.jpg | head -n1) | grep Quality | cut -d: -f2)"
for FILE in *.jpg ; do gm convert -quality $quality -crop "$halfwidth"x"$height"+0+0 "$FILE" "${FILE%%.jpg}-A.jpg" ; mv `ls *.jpg | grep A` even-odd ; gm convert -quality $quality -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "${FILE%%.jpg}-B.jpg" && mv `ls *.jpg | grep B` even-odd
 done ;

for imagemagick

Code: Select all

if [ ! -e even-odd ]; then mkdir even-odd; fi
first="`ls -1 *.jpg | head -n1`"
let "halfwidth=` identify -format '%w \n' "$first"`/2"
width="`identify -format '%w \n' "$first"`"
height="`identify -format '%h \n' "$first"`"
quality="$(identify -verbose $(ls *.jpg | head -n1) | grep Quality | cut -d: -f2)"
for FILE in *.jpg ; do convert -quality $quality -crop "$halfwidth"x"$height"+0+0 "$FILE" "${FILE%%.jpg}-A.jpg" ; mv `ls *.jpg | grep A` even-odd ;  convert -quality $quality -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "${FILE%%.jpg}-B.jpg" && mv `ls *.jpg | grep B` even-odd
 done ;

[sumphotons]

Thanks for the script! It works flawlessly but I have a suggestion to make it more efficient. Your script invokes 'identify' 4 times to calculate height, width and quality and 'convert' twice. All of that can be done by one invocation of 'convert'. Use the following form:

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convert *.jpg -crop 2x1@ Page%d.jpg

This will split all the input files in half with the same quality setting as the original and create files with names Page0.jpg, Page1.jpg, Page2.jpg, etc. where the even numbered files are the left hand pages and odds are the right hand ones.

One issue with using wild cards for specifying input files is the memory used by 'convert' - it seems to be proportional to the number of files that match the wild card. So if you have a lot of files, use a 'for' loop and use the above command on individual files. Something like this ...

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i=0
for FILE in *.jpg
do
    convert $FILE -crop 2x1@ temp%d.jpg
    mv temp0.jpg Page${i}.jpg
    i=`expr $i + 1`
    mv temp1.jpg Page${i}.jpg
    i=`expr $i + 1`
done

[dingodog]

thanks for remarks, for now I'm planning to add other features, and finally I'll rewrite script looking at speed and efficiency

meanwhile I improved script in order to allow to enter the extension of images that we want split at half (without dot)

assuming we save this script in a file named splithalfimgs, the syntax will be

for png images

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splithalfimgs png

for jpg images

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splithalfimgs tiff

and so on...

for graphicsmagick

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#!/bin/sh
#
#script to split an image in its two halves
#
#usage:
#
#splithalfimgs image extension (without dot)
#
#for instance: (for png):
#
#splithalfimgs png
#
#(for jpg)
#
#splithalfimgs jpg
#
#and so on...
if [ ! -e even-odd ]; then mkdir even-odd; fi
filetype=$1
first="`ls -1 *.$filetype | head -n1`"
let "halfwidth=`gm identify -format '%w \n' "$first"`/2"
width="`gm identify -format '%w \n' "$first"`"
height="`gm identify -format '%h \n' "$first"`"
if [ "$filetype" == "jpg" ]
then
quality="$(gm identify -verbose $(ls *.$filetype | head -n1) | grep Quality | cut -d: -f2)"
for FILE in *.$filetype ; do gm convert -quality $quality -crop "$halfwidth"x"$height"+0+0 "$FILE" "${FILE%%.$filetype}-A.$filetype" ; mv `ls *.$filetype | grep A` even-odd ; gm convert -quality $quality -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "${FILE%%.$filetype}-B.$filetype" && mv `ls *.$filetype | grep B` even-odd
 done
 else
  for FILE in *.$filetype ; do gm convert -crop "$halfwidth"x"$height"+0+0 "$FILE" "${FILE%%.$filetype}-A.$filetype" ; mv `ls *.$filetype | grep A` even-odd ; gm convert -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "${FILE%%.$filetype}-B.$filetype" && mv `ls *.$filetype | grep B` even-odd; done
 fi
 exit 0
 

for imagemagick

Code: Select all

#!/bin/sh
#
#script to split an image in its two halves
#
#usage:
#
#splithalfimgs image extension (without dot)
#
#for instance: (for png):
#
#splithalfimgs png
#
#(for jpg)
#
#splithalfimgs jpg
#
#and so on...
if [ ! -e even-odd ]; then mkdir even-odd; fi
filetype=$1
first="`ls -1 *.$filetype | head -n1`"
let "halfwidth=` identify -format '%w \n' "$first"`/2"
width="` identify -format '%w \n' "$first"`"
height="` identify -format '%h \n' "$first"`"
if [ "$filetype" == "jpg" ]
then
quality="$( identify -verbose $(ls *.$filetype | head -n1) | grep Quality | cut -d: -f2)"
for FILE in *.$filetype ; do  convert -quality $quality -crop "$halfwidth"x"$height"+0+0 "$FILE" "${FILE%%.$filetype}-A.$filetype" ; mv `ls *.$filetype | grep A` even-odd ;  convert -quality $quality -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "${FILE%%.$filetype}-B.$filetype" && mv `ls *.$filetype | grep B` even-odd
 done
 else
  for FILE in *.$filetype ; do  convert -crop "$halfwidth"x"$height"+0+0 "$FILE" "${FILE%%.$filetype}-A.$filetype" ; mv `ls *.$filetype | grep A` even-odd ;  convert -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "${FILE%%.$filetype}-B.$filetype" && mv `ls *.$filetype | grep B` even-odd; done
 fi
 exit 0
 

[dingodog]

Woof Woof!
script update

splithalfimgs v. 0.3 (added ability to split at half book scans consisting into tiff files showing 2 pages at once)

script recognizes what compression is used for tiff image and re-applies the same compression when cutting

for graphicsmagick

Code: Select all

#!/bin/bash
#
#script to split an image in its two halves
#
#usage:
#
#splithalfimgs image extension (without dot)
#
#for instance: (for png):
#
#splithalfimgs png
#
#(for jpg)
#
#splithalfimgs jpg
#
#and so on...
if [ ! -e even-odd ]; then mkdir even-odd; fi
filetype=$1
first="`ls -1 *.$filetype | head -n1`"
let "halfwidth=`gm identify -format '%w \n' "$first"`/2"
width="`gm identify -format '%w \n' "$first"`"
height="`gm identify -format '%h \n' "$first"`"
if [ "$filetype" == "jpg" ]
then
quality="$(gm identify -verbose $(ls *.$filetype | head -n1) | grep Quality | cut -d: -f2)"
for FILE in *.$filetype ; do gm convert -quality $quality -crop "$halfwidth"x"$height"+0+0 "$FILE" "${FILE%%.$filetype}-A.$filetype" ; mv `ls *.$filetype | grep A` even-odd ; gm convert -quality $quality -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "${FILE%%.$filetype}-B.$filetype" && mv `ls *.$filetype | grep B` even-odd
 done
 elif [ "$filetype" == "tiff" ]
 then
compression="$(gm identify -verbose $(ls *.$filetype | head -n1) | grep Compression | cut -d: -f2 | xargs)"
for FILE in *.$filetype ; do gm convert -compress $compression -crop "$halfwidth"x"$height"+0+0 "$FILE" "${FILE%%.$filetype}-A.$filetype" ; mv `ls *.$filetype | grep A` even-odd ; gm convert -compress $compression -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "${FILE%%.$filetype}-B.$filetype" && mv `ls *.$filetype | grep B` even-odd
 done
 else
  for FILE in *.$filetype ; do gm convert -crop "$halfwidth"x"$height"+0+0 "$FILE" "${FILE%%.$filetype}-A.$filetype" ; mv `ls *.$filetype | grep A` even-odd ; gm convert -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "${FILE%%.$filetype}-B.$filetype" && mv `ls *.$filetype | grep B` even-odd; done
 fi
 exit 0

for imagemagick

Code: Select all

#!/bin/bash
#
#script to split an image in its two halves
#
#usage:
#
#splithalfimgs image extension (without dot)
#
#for instance: (for png):
#
#splithalfimgs png
#
#(for jpg)
#
#splithalfimgs jpg
#
#and so on...
if [ ! -e even-odd ]; then mkdir even-odd; fi
filetype=$1
first="`ls -1 *.$filetype | head -n1`"
let "halfwidth=` identify -format '%w \n' "$first"`/2"
width="` identify -format '%w \n' "$first"`"
height="` identify -format '%h \n' "$first"`"
if [ "$filetype" == "jpg" ]
then
quality="$( identify -verbose $(ls *.$filetype | head -n1) | grep Quality | cut -d: -f2)"
for FILE in *.$filetype ; do  convert -quality $quality -crop "$halfwidth"x"$height"+0+0 "$FILE" "${FILE%%.$filetype}-A.$filetype" ; mv `ls *.$filetype | grep A` even-odd ;  convert -quality $quality -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "${FILE%%.$filetype}-B.$filetype" && mv `ls *.$filetype | grep B` even-odd
 done
 elif [ "$filetype" == "tiff" ]
 then
compression="$( identify -verbose $(ls *.$filetype | head -n1) | grep Compression | cut -d: -f2 | xargs)"
for FILE in *.$filetype ; do  convert -compress $compression -crop "$halfwidth"x"$height"+0+0 "$FILE" "${FILE%%.$filetype}-A.$filetype" ; mv `ls *.$filetype | grep A` even-odd ;  convert -compress $compression -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "${FILE%%.$filetype}-B.$filetype" && mv `ls *.$filetype | grep B` even-odd
 done
 else
  for FILE in *.$filetype ; do  convert -crop "$halfwidth"x"$height"+0+0 "$FILE" "${FILE%%.$filetype}-A.$filetype" ; mv `ls *.$filetype | grep A` even-odd ;  convert -crop "$width"x"$height"+"$halfwidth"+0 "$FILE" "${FILE%%.$filetype}-B.$filetype" && mv `ls *.$filetype | grep B` even-odd; done
 fi
 exit 0

[markvdb]

Woof Woof!
script update

splithalfimgs v. 0.3

Want to make this even more useful and visible? Then you might want to:
* add a clear copyright header to this script (gplv3 for example, see http://www.gnu.org/licenses/gpl-howto.html for instructions)
* fork the official diybookscanner git repository at https://github.com/markvdb/diybookscanner and let me pull in your work?

I'll gladly help you with any questions you might have about this.

Mark