Slice up PDFs like a pro.
Slice up PDFs like a pro:
% bocho my-fancy-file.pdf --pages 1 3 5 6 10 --angle 30 --zoom 1.6 my-fancy-file-bocho-630x290.png
Takes a PDF file and creates a “stacked page” preview from a selection of pages.
It accepts a bunch of options for customising the output (pass the -h flag for details).
Requires ImageMagick so you might need to, e.g:
% sudo apt-get install imagemagick
If you want to use Wand instead of calling convert directly, you’ll also need to perform some some additional steps, e.g:
% sudo apt-get install libmagickwand-dev % pip install wand
See their installation instructions for more details.
On OS X, you’ll want to use Homebrew to get the low-level dependencies in place:
% brew install ghostscript imagemagick
Once all that’s sorted, you just need to pip install deba-bocho.
PyPy: Oh My!
For simple operations, there’s not much difference in performance between CPython and PyPy. If you want to use the shadow effect, it’s a different matter. Cue unscientific benchmarking run on my laptop…
% time bocho /tmp/report.pdf --preset example --shadow ... bocho /tmp/report.pdf --preset example --shadow 35.89s user 0.15s system 99% cpu 36.132 total
% time bocho /tmp/report.pdf --preset example --shadow ... bocho /tmp/report.pdf --preset example --shadow 4.10s user 0.18s system 99% cpu 4.297 total
Making PyPy about 10x as fast as Python 2.7. The same process without --shadow takes around 2.5 seconds with both implementations.
For information on usage, run bocho --help. If you want to use it as a module:
>>> import bocho >>> help(bocho.assemble)
If you will be using the same options many times, it’s probably worth creating a preset in a config.ini file (see config.example.ini or the example below to get started).
By default, bocho will check for $HOME/.config/bocho/config.ini, so it’s probably best to keep your config there, but you can pass the --config option with the path to an alternative location.
[example] pages = 1,3,5,7,9 width = 630 height = 290 border = 4 reuse = true delete = true verbose = true use_convert = true parallel = 5
You can tell bocho to use this preset by calling:
bocho /path/to/file.pdf --preset example [--config /path/to/config.ini]
- implement rotation properly ✓
- allow a “zoom” option ✓
- optional drop-shadows ✓
- make shadows smarter in their orientation (they’re currently uniform, not respecting the angle / transformations)
- make the basic edge separators optional ✓
- automatic spacing as an option as well as fixed pixel spacing
- horizontal and vertical spacing ✓
- horizontal and vertical offsets ✓
- optional right-to-left stacking ✓
- handle non-A4 aspect ratio input documents ✓
- optionally apply transforms:
- affine ✗ (abandoned in favour of vertical / horizontal shear effects)
- shear ✓ (applied by creating simplified affine transforms)
- stretch (can be achieved in a similar fashion to shear)
- ensure sliced PNGs are large enough when custom width / height are specified
- fix x and y spacing calculation to account for any applied rotation & transformation
- allow transforms to be configurable (probably with presets defined in an .ini file)
- drop the PyPDF dependency ✓
- use an ImageMagick binding rather than using subprocess to call convert ✓ (Wand)
- optionally re-use pages between runs ✓
- allow user-specified resolution for the PDF to PNG conversion ✓
- docs ✓
- pretty pictures illustrating the effect of the various options
- use proper logging
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