QOI image compression

Python implementation of QOI encoder and decoder

QOI format: https://qoiformat.org/

Installation

git clone https://github.com/adusachev/QOI-image-compression.git

python3 -m venv venv
source venv/bin/activate

python3 setup.py install

Usage

1. Encode: convert png image to qoi image

from qoi_compress import qoi_encoder, qoi_decoder

png_file = "./png_images/doge.png"
qoi_file = "./qoi_images/doge.qoi"  # where to save qoi image

qoi_encoder.run_encoder(png_file, qoi_file)

2. Decode: import .qoi file into numpy array

from qoi_compress import qoi_encoder, qoi_decoder

qoi_file = "./qoi_images/doge.qoi"

img_decoded, time_elapsed = qoi_decoder.run_decoder(qoi_file)
print(img_decoded)

save decoded image as png:

import numpy as np
from PIL import Image
im = Image.fromarray(img_decoded.astype(np.uint8))
im.save("img_decoded.png")

3. Test: encode image png_file and save it as qoi_file, then decode qoi_file and compare decoded qoi image with original png image

from qoi_compress.main import run_single_experiment

png_file = "./png_images/doge.png"
qoi_file = "./qoi_images/doge.qoi"

run_single_experiment(png_file, qoi_file)

Benchmarks

Image size	Encoding time	Decoding time	Compression ratio
460x460	0.7 sec	0.3 sec	2.2
1920x1080	5.5 sec	2.5 sec	2.56
3840x2400	42 sec	19 sec	1.83

TODO

Add support for RGBA images