This library offers a fast conversion tools such as (HSL to RGB ) and (RGB to HSL)
ported into cython for better performances
Conversions between color systems (cython library)
This module defines bidirectional conversions of color values between colors
expressed in the RGB (Red Green Blue) color space used in computer monitors and three
HLS (Hue Lightness Saturation).
pip install HSL
from HSL.hsl import rgb_to_hsl, hsl_to_rgb
if __name__ == '__main__':
ONE_255 = 1.0 / 255.0
r, g, b = 25, 60, 128
print("\nOriginal RGB values (R:%s, G:%s, B:%s)\n" % (r, g, b))
h, s, l = rgb_to_hsl(r * ONE_255, g * ONE_255, b * ONE_255)
print("HSL values (H:%s, S:%s, L:%s)" % (h * 360.0, s * 100.0, l * 100.0))
r, g, b = hsl_to_rgb(h, s, l)
print("Retrieved RGB values (R:%s, G:%s, B:%s)\n" % (r * 255.0, g * 255.0, b * 255.0))If you need to compile the Cython code after changing the files hsl.pyx or hsl.pxd or
the external C code please proceed as follow:
1) open a terminal window
2) Go in the main project directory where (hsl.pyx & hsl.pxd files are located)
3) run : python setup_hsl.py build_ext --inplace
If you have to compile the code with a specific python version, make sure
to reference the right python version in (python setup_hsl.py build_ext --inplace)
If the compilation fail, refers to the requirement section and make sure cython
and a C-compiler are correctly install on your system.
- A compiler such visual studio, MSVC, CGYWIN setup correctly on your system.
- a C compiler for windows (Visual Studio, MinGW etc) install on your system
and linked to your windows environment.
Note that some adjustment might be needed once a compiler is install on your system,
refer to external documentation or tutorial in order to setup this process.
e.g https://devblogs.microsoft.com/python/unable-to-find-vcvarsall-bat/
Yoann Berenguer
python >= 3.0
cython >= 0.28
MIT License
Copyright (c) 2019 Yoann Berenguer
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
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The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
Test with 1000000 iterations
This library
rgb_to_hsl per call 2.061723e-07 overall time 0.206172 seconds
hsl_to_rgb per call 1.181744e-07 overall time 0.118174 seconds
Colorsys library
colorsys.rgb_to_hls per call 1.054554e-06 overall time 1.054554 seconds
colorsys.hls_to_rgb per call 8.701219e-07 overall time 0.870121 seconds