CODEWITHSUNDEEP
bashpdfresizeflash
shaneod
shaneod

Reputation: 49

Determine if each page in PDF has the same height

I use the following code to convert swf books to pdf:

swftopdf () {
    if [ ! -f "$1.pdf" ]; then
        wget "http://content.yudu.com/android/dJcuwVV99lEgqWoc/content/$1.high";
        mimetype=$(file $1.high --mime-type);
        if [ "$mimetype" == "$1.high: application/x-shockwave-flash" ]; then
            swfrender -Y 2500 "$1.high" -o "$1.png"; convert "$1.png" "$1.pdf";
        else
            convert "$1.high[x2500]" "$1.pdf";
        fi;
        rm -rf $1.high; rm -rf $1.png;
    fi;
};
for i in {1..244}; do
    while [ ! -f "$i.pdf" ]; do
        swftopdf $i;
    done;
done;
filelist=$(ls|sort -n);
pdftk $filelist cat output '/home/shane/Desktop/Complete Ebooks/Secondary Level/Leaving Cert/Folens/Othello.pdf' compress; rm -rf *.pdf

Rarely, the .high file would be a jpg rather than a swf, hence why there's the else convert "$i1.high[x2500]" segment. However, I didn't initially have [x2500] written there.


So, what I'm wondering is, rather than deleting all the books I've already converted,
is there any way of figuring out if any of the pages has a height which differs to 2500 in the large pdf (the .high's, .png's and individual .pdf's are already deleted), so I can then delete and reconvert that book, so that the jpg pages have a height of 2500 too? Thanks


Also, if anyone knows a less convoluted way of doing this, I'd appreciate it if they told me it


If you need an example of 1 page being a .swf, and another being a .jpg, for explanatory purposes:
http://content.yudu.com/android/dJcuwVV99lEgqWoc/content/1.high - swf
http://content.yudu.com/android/dJcuwVV99lEgqWoc/content/2.high - jpg

Upvotes: 2

Views: 112

Answers (1)

leu
leu

Reputation: 2081

Since you have ImageMagick installed, you can use identify to answer the question whether all pages are of the same height. Here is an example of an arbitrarily choosen PDF:

> identify MyFile.pdf 
MyFile.pdf[0] PDF 524x751 524x751+0+0 16-bit Bilevel DirectClass 49.6KB 0.050u 0:00.050
MyFile.pdf[1] PDF 524x751 524x751+0+0 16-bit Bilevel DirectClass 49.6KB 0.050u 0:00.050
MyFile.pdf[2] PDF 524x751 524x751+0+0 16-bit Bilevel DirectClass 49.6KB 0.050u 0:00.040

Don't be surprised if the output of identify doesn't tell a height of 2500: Your example JPG file has a resolution of 149 ppi. PDF usually takes 72dpi. So I'd expect your converted JPG to have a height of 1208 (= 2500 * 72/149):

> convert 2.high[x2500] 2.pdf
> identify 2.pdf

2.pdf PDF 870x1208 870x1208+0+0 16-bit Bilevel DirectClass 132KB 0.010u 0:00.000

Hope that helps...

Upvotes: 1

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