On 5/21/19 12:06 PM, Christian Heimes wrote: > On 21/05/2019 11.49, Nathaniel Smith wrote: >> On Tue, May 21, 2019 at 2:40 AM Walter Dörwald <walter at livinglogic.de> wrote: >>> >>> On 20 May 2019, at 22:15, Christian Heimes wrote: >>> >>>> Hi, >>>> >>>> here is the first version of my PEP 594 to deprecate and eventually >>>> remove modules from the standard library. The PEP started last year >>>> with talk during the Python Language Summit 2018, >>>> https://lwn.net/Articles/755229/. >>>> >>>> [...] >>>> >>>> colorsys >>>> ~~~~~~~~ >>>> >>>> The `colorsys <https://docs.python.org/3/library/colorsys.html>`_ >>>> module >>>> defines color conversion functions between RGB, YIQ, HSL, and HSV >>>> coordinate >>>> systems. The Pillow library provides much faster conversation between >>>> color systems. >>>> >>>> Module type >>>> pure Python >>>> Deprecated in >>>> 3.8 >>>> To be removed in >>>> 3.10 >>>> Substitute >>>> `Pillow <https://pypi.org/project/Pillow/>`_, >>>> `colorspacious <https://pypi.org/project/colorspacious/>`_ >>> >>> I'm using colorsys constantly as the basis for a tool that converts CSS >>> colors between different coordinate systems. I don't see how that could >>> be done via Pillow (which AFAICT only converts complete images). >>> RGB<->HSV<->HLS conversion seems to be not available (or not obvious) in >>> colorspacious. >> >> Correct, colorspacious doesn't support HSV or HLS. I suppose it would >> be trivial enough to add... >> >> The 'colour' package has them (along with everything else you can >> dream of): https://colour.readthedocs.io/en/latest/colour.models.html > > Nice catch, I just added https://python-colormath.readthedocs.io/en/latest/ to my update PR. I'll add colour to the list, too. > > (It didn't pop up on my radar because I wasn't checking for British spelling) > > Christian Please, don't remove colorsys. HSL and HSV aren't outdated, and AFAIK, the module is not a maintenance burden. The packages on PyPI offer more advanced models. Perhaps they could be linked in the documentation, if we want to endorse them. But just as we're not removing `array` in favor of `numpy`, we shouldn't remove colorsys either. Colorsys is not dead, it's just small. I assume one of the reasons colorspacious doesn't support HSV or HLS is that HSV/HLS tends to be used for quite different purposes than the more fancy color spaces. You'd use HSL/HSV for a simple color picker or a saturation shift on a web page, GUI or game (where you don't have *exact* colors anyway); things like sRGB or CIELab are for color management, photos, printing, etc.
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