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 <wal...@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 HSL and HSV aren't outdated, and AFAIK,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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