pyrogis 0.2.0

image processing framework

pierogis

image processing framework

pierogis is a framework for image processing. Ingredients that describe image processing functions can be assembled into recipes and cooked.

pyrogis is a python library and cli tool implementing this framework.

pip install pyrogis
pyrogis chef input.png "sort; quantize" -o output.png

• install
• features
• cli
• package
• acknowledgements
• issues and contributing

install

install from a wheel with pip

pip install pyrogis

Depends on numpy and PIL. PIL requires some external C libraries for handling image files. You probably don't have to worry about this. If you do, try a conda installation.

To build from source (either the repository or the sdist), you will need to install the rust stable toolchain and setuptools-rust.

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
pip install setuptools-rust

pip install .

features

• CLI - Use the CLI to cook à la carte recipes, or provide a recipe in a document
• Animations - Animations (gifs and movies) can be cooked in one command
• Extendable - Easy to create custom manipulations (see package)
• Lazy Rendering - Render a manipulation after constructing your pipeline (see package)
• Numpy or Rust backend - Image processing functions use Numpy for (python relative) fast operations. Some ingredients use compiled Rust for more speed.

usage

cli

All of the cli commands look like this.

pyrogis {order} {path} [-o output] [... order options] [--frames] [--fps fps] [--duration duration] [--no-optimize]

order is one of

• chef
• sort
• quantize
• threshold
• resize
• plate

The following options are used for each order (sort, quantize, etc.). A directory can be used for path, in which case the program will try to cook each file in the directory. If an output filename or dir is provided, it should match the expected output.

In addition, each order or "menu item" has its own set of options.

arg	description	default	valid
order	order type / menu item to cook	required	sort, quantize, chef, threshold, plate, resize
path	path to input media	required	dir, image, animation
-o,--output	name of the output directory or file	depends on output type	str
--frames	if present, frames will be cooked but not assembled into animation (output is treated as dir)	False	flag
--fps	fps to output an animation at (ignored if single frame)	25	int
--duration	ms frame duration to output an animation with (ignored if single frame, overrides duration)	None	int
--no-optimize	if present and output would be .gif, the gif is not optimized using pygifsicle	False	int

If the input file is a directory or a movie file (anything animated), the output will be an animation as well. Artifact "cooked" folder will contain frames. If you don't understand what output type to expect from your command, don't provide output.

sort

sort pixels along an axis

pyrogis sort ./input.jpg -l 50 -u 180 -t 1

Use -l and -u as lower and upper thresholds where contiguous groups of pixels with brightness outside of the thresholds are sorted.

If only lower is provided, upper is set to 255. If only upper is provided, lower is set to 0.

arg	description	default	valid
-l, --lower-threshold	pixels with intensity below this value are sorted	64	0-255
-u, --upper-threshold	pixels with intensity above this value are sorted	180	0-255
-t, --turns	number of clockwise turns from sorting bottom to top	0	0-3
--ccw	if provided, turns will be applied counter-clockwise	False	flag

quantize

quantize an image to a smaller set of colors

pyrogis quantize input.jpg -c aaaaaa 43ad32 696969 --repeats 3 --iterations 3
# or
pyrogis quantize input.jpg -n 16 --repeats 3 --iterations 3

Wraps rscolorq) in python. Thank you to the author of that package.

arg	description	default	valid
-c, --colors	hex colors to base palette on (palette size ignored)	None	int
-n, --palette_size	number of colors in the palette to cluster for	8	int
--repeats	number of times to repeat a temperature for DA	1	int
--iterations	number of times to repeat an iteration of a coarseness level	1	int
--initial-temp	initial temp to use in DA for optimization	1	float
--final-temp	final temp to use in DA for optimization	0.001	float
--dithering-level	relative dithering level (use .5-1.5)	0.8	float

chef

parse text for a recipe

.txt files and quoted strings can describe a series of CLI recipes, piped from one to the next.

pyrogis chef ./input.jpg "sort -u 100; quantize"
# or
pyrogis chef ./input.jpg recipe.txt

recipe.txt

sort -u 100; quantize

arg	description	default	valid
recipe	path to json or txt file to use as a recipe	recipe.txt	str

threshold

pixels included or excluded based on brightness

Pixels with brightness outside of the thresholds provided become "included". Pixels within the thresholds become "excluded" (greater than lower, but less than upper). By default, included means replaced with white, excluded with black.

sort uses this under the hood.

pyrogis threshold ./input.jpg -u 150 -l 20 

arg	description	default	valid
-u,--upper-threshold	pixels above this value are white	180	int
-l,--lower-threshold	pixels below this value are white	64	int
--include	hex color to substitute for white	ffffff	str
--exclude	hex color to substitute for black	000000	str

resize

change the size of an image with options to maintain aspect ratio

Provide one of width or height and the other will scale appropriately. Use of both height and width is probably redundant and will stretch the image if the ratio is not the same.

scale can also be provided as an alternative or alongside height/width.

By default, a nearest neighbor scaling "filter" is used. When scaling up, nearest neighbor preserves the pixelated look if scale is a whole number (or width/height are provided as multiples of the current size).

See PIL documentation on filters

When used in a chef recipe, scaling down at the beginning of a recipe and up at the end can lead to cool (and faster) results.

pyrogis resize ./input.jpg -s .25
pyrogis resize ./input.jpg -s 4

# or using exact dimension (aspect ratio maintained)
pyrogis resize ./input.jpg -h 200
pyrogis resize ./input.jpg -h 800

arg	description	default	valid
--width	width to resize to	None	int
--height	height to resize to	None	int
--scale	scale multiplier for width and height	1	float
--filter	a filter to be used with resizing	nearest	nearest, bicubic, bilinear, box, hamming, lanczos

plate

bundle a directory of frames into an animation

When --frames flag is present for a cook operation on an animation file (gif, mp4, etc.), the output is left in a directory and not compiled into a movie file.

plate can be used to take this input directory and compile into a movie file.

Doesn't work as an ingredient in chef recipe.

duration will override fps.

The options for this can be provided to any order if the output would be an animation.

pyrogis plate ./cooked --fps 50

arg	description	default	valid
--fps	fps to output an animation at (ignored if single frame)	25	int
--duration	ms frame duration to output an animation with (ignored if single frame, overrides duration)	None	int
--no-optimize	if present and output would be .gif, the gif is not optimized using pygifsicle	False	int

package

"pierogis is the name of the framework;

pyrogis is the name of the python package and cli tool"

- a wise man

import pyrogis

Docs are automatically generated by pdoc

The created files can be found in this repository in the docs folder

acknowledgements

The original python pixelsort package inspired this package. While the underlying algorithm of that package and of sort in this one is supposed to be functionally the same, details of the implementation may differ, and it makes up just part of this package.

The quantizing algorithm used in this package is implemented by rscolorq, which is a port of scolorq, itself an implementation of Spatial Color Quantization.

issues and contributing

When you encounter an error, there are some guidelines that will make it easier to help you:

• Ensure that you are using the latest version of the package. It's early days so errors and updates will be frequent. Use pip uninstall pyrogis then pip install pyrogis --no-cache-dir to reinstall.
• Provide the version of pyrogis that you are using in issues to rule that out. pip list -> pyrogis _._._
• Provide the traceback or error message if you can.
• Provide your os and any other specific information relevant to how you are trying to use the package.
• Provide the code or the cli command that triggered the error.
• If the problem is visual: that can be more difficult to debug. Try to use an image hosting site if you want to share what you are seeing in an issue.
• If you are getting different behavior than you expect: that could be an error or a feature too.
• If your problem is with installation: try conda, preinstall numpy and pillow, install the rust toolchain, and start praying. There will be a website with a visual editor for this software so stay tuned.

Hopefully all levels of skills can use this package. Any form of contributing is appreciated; passive-aggressive semi-anonymous thumbs down is not appreciated.

Everyone using and contributing to this package is doing it for the love of the game.

Don't feel like your issue is too small to make an issue. Pull requests are always welcome and anyone interested in dev work should join the discord.

Ingredient type algorithm/function suggestions can go in the ingredients channel. You can post your creations in the demo channel as well.

changelog

v0.2.0

• ingredients

  • add frames support in Dish (and cli)
  • add Resize ingredient
  • refactor how seasonings are handled
  • swap sort logic (sort white pixels)

• chef

  • add Threshold option to provide hex color for include and exclude
  • add Quantize option to provide colors for palette
  • add Resize order

• testing

  • add Resize testing
  • add cli/parser testing

• misc

  • change references to rpierogis to pierogis_rs

• bugs

  • fix chef handle trailing semi-colon in recipe

v0.1.3

• ingredients

  • threshold default behavior change
  • threshold now accepting exclude/include pixels as usize for windows support

• chef

  • menu items as separate classes from chef

• package

  • lots of formatting/lint fixes, notably subpackage imports
  • documentation improvements

• tests

  • threshold tests added

v0.1.2

• chef

  • redo handling of input dir and unknown output name
  • add quiet flag

• documentation

  • fix some typos in readme

v0.1.1

• ingredients

  • fix Quantize.prep not catching extra kwargs

• documentation

  • update readme to reflect changes in package name and quantize

• deploy

  • combine test pypi and normal pypi publish

v0.1.0

• ingredients

  • Quantize (using rscolorq or from palette)
  • Sort (Numpy implementation)
  • Recipe and Dish
  • quantize, sort, and chef CLI recipes
  • Threshold (in both Numpy and Rust), and Seasoning
  • Flip and Rotate

• deploy

  • release on PyPi