Image Processing

ImageMagick "not authorized" exception

vi /etc/ImageMagick-6/policy.xml

change

to:

convert filein.ps -trim fileout_%03d.png

(in bash)

for f in *.pdf; do

fout=${f%.pdf}.png

echo $fout

convert -density 150 ./"$f" ./"${f%.pdf}.png"

done

Convert a specific page inside one pdf:

convert -density 150 source.pdf[1] dest.png

Split pdf into pages:

pdftk A=input.pdf cat A42 A43 output pages_42_43.pdf

Use python to split pdf into pages:

#!/usr/bin/env python

import copy, sys

from pyPdf import PdfFileWriter, PdfFileReader

input = PdfFileReader(sys.stdin)

output = PdfFileWriter()

for i in [42, 43]:

output.addPage(input.getPage(i))

output.write(sys.stdout)

1. Open image in gimp and select what is to be cropped with the rectangle tool.

2. Note the size and position in pixels of the selected rectangle

3. In the folder with the images: mogrify -crop {width}x{height}+{x}+{y} *png

with ImageMagick (loop 0 are infinite):

convert -delay 40 -loop 0 *jpg movie.gif

or, the complicated way...

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