chromahash (Python)
Modern, high-quality image placeholder representation for professional formats (LQIP)
chromahash encodes an image into a compact, fixed 32-byte Low Quality Image
Placeholder (LQIP) and decodes it back into a low-fidelity preview. Color is
encoded in the perceptually-uniform OKLAB
space with wide-gamut input support (sRGB, Display P3, Adobe RGB, BT.2020,
ProPhoto RGB) and decodes to a caller-chosen display gamut (sRGB, Display P3,
or Adobe RGB).
This is the Python binding — a thin facade over UniFFI-generated ctypes
bindings to the Rust core. It carries no native algorithm of its own and produces
output bit-identical to every other ChromaHash implementation, validated
against the shared spec/ test vectors. It has zero external runtime
dependencies (ctypes is part of the standard library).
pip install chromahash
Usage
from chromahash import ChromaHash, Gamut
# width × height × 4 bytes (RGBA) — a 2×2 image here.
rgba = bytes([
255, 0, 0, 255, 0, 255, 0, 255,
0, 0, 255, 255, 255, 255, 0, 255,
])
ch = ChromaHash.encode(2, 2, rgba, Gamut.SRGB)
print(ch.as_bytes().hex()) # 32 bytes
# Reconstruct a preview. decode() targets sRGB; pass Gamut.DISPLAY_P3 or
# Gamut.ADOBE_RGB to render wide-gamut color.
width, height, pixels = ChromaHash.from_bytes(ch.as_bytes()).decode()
print(width, height, len(pixels))
Building from source
The native library and the generated bindings module are build outputs, staged by the mise task (needs the Rust toolchain):
mise run cbuild:python # stages chromahash/_uniffi.py + the native lib
mise run build:python and mise run test:python run this step automatically.
See the project repository for the full format specification and the other language implementations.
Note: ChromaHash is a pre-1.0 Draft format — the bitstream is not yet guaranteed stable across versions.
License
Licensed under either of Apache License, Version 2.0 or MIT license at your option.
1 maintainer
Metadata
1 maintainer
Release files for chromahash 0.7.2
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Built distributions (wheels)
| File | Actions Reset | |||
|---|---|---|---|---|
| chromahash-0.7.2-py3-none-win_amd64.whl | Python 3 | none | Windows x86-64 | Details for chromahash-0.7.2-py3-none-win_amd64.whl |
| chromahash-0.7.2-py3-none-manylinux2014_x86_64.whl | Python 3 | none | Linux glibc 2.17+ x86-64 | Details for chromahash-0.7.2-py3-none-manylinux2014_x86_64.whl |
| chromahash-0.7.2-py3-none-manylinux2014_aarch64.whl | Python 3 | none | Linux glibc 2.17+ ARM64 | Details for chromahash-0.7.2-py3-none-manylinux2014_aarch64.whl |
| chromahash-0.7.2-py3-none-macosx_11_0_x86_64.whl | Python 3 | none | macOS 11.0+ x86-64 | Details for chromahash-0.7.2-py3-none-macosx_11_0_x86_64.whl |
| chromahash-0.7.2-py3-none-macosx_11_0_arm64.whl | Python 3 | none | macOS 11.0+ ARM64 | Details for chromahash-0.7.2-py3-none-macosx_11_0_arm64.whl |
Total release size: 1.6 MB
Release files / chromahash-0.7.2-py3-none-win_amd64.whl
| Download URL | chromahash-0.7.2-py3-none-win_amd64.whl |
|---|---|
| Size | 235.0 kB |
| Tags | Python 3 Windows x86-64 |
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| Download URL | chromahash-0.7.2-py3-none-manylinux2014_x86_64.whl |
|---|---|
| Size | 351.0 kB |
| Tags | Linux glibc 2.17+ x86-64 Python 3 |
|
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| Size | 331.3 kB |
| Tags | Linux glibc 2.17+ ARM64 Python 3 |
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| Tags | Python 3 macOS 11.0+ x86-64 |
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