plotly / colorlover

Color scales in Python for humans

colorlover

Color scales for humans

IPython notebook: https://plot.ly/ipython-notebooks/color-scales/

import colorlover as cl
from IPython.display import HTML
HTML(cl.to_html( cl.flipper()['seq']['3'] ))

Install

sudo pip install colorlover

IPython notebook (demo)

https://plot.ly/ipython-notebooks/color-scales/

Docs

cl.scales

All of the color scales in colorlover

>>> import colorlover as cl
>>> cl.scales['3']['div']['RdYlBu']

['rgb(252,141,89)', 'rgb(255,255,191)', 'rgb(145,191,219)']

cl.to_numeric( scale )

Converts scale of RGB or HSL strings to list of tuples with RGB integer values

>>> cl.to_numeric( cl.scales['3']['div']['RdYlBu'] )

[(252.0, 141.0, 89.0), (255.0, 255.0, 191.0), (145.0, 191.0, 219.0)]

cl.to_hsl( scale )

Converts a string RGB or numeric RGB colorscale to HSL

>>> cl.to_hsl( cl.scales['3']['div']['RdYlBu'] )

['hsl(19.0, 96.0%, 67.0%)', 'hsl(60.0, 100.0%, 87.0%)', 'hsl(203.0, 51.0%, 71.0%)']

cl.to_rgb( scale )

Convert an HSL or numeric RGB color scale to string RGB color scale

>>> cl.to_rgb( cl.scales['3']['div']['RdYlBu'] )

['rgb(252,141,89)', 'rgb(255,255,191)', 'rgb(145,191,219)']

cl.to_html( scale )

Traverse color scale dictionary and return available color scales as HTML string

>>> cl.to_html( cl.scales['3']['div']['RdYlBu'] )

'<div style="background-color:rgb(252,141,89);height:20px;width:20px;display:inline-block;"></div><div style="background-color:rgb(255,255,191);height:20px;width:20px;display:inline-block;"></div><div style="background-color:rgb(145,191,219);height:20px;width:20px;display:inline-block;"></div>'

cl.flipper( scale=None )

Return the inverse of the color scale dictionary cl.scale

>>> cl.flipper()['div']['3']['RdYlBu']

['rgb(252,141,89)', 'rgb(255,255,191)', 'rgb(145,191,219)']

cl.interp( scale, r )

def interp(scl, r):

Interpolate a color scale "scale" to a new one with length "r"

# fun usage in IPython notebook
from IPython.display import HTML
HTML( to_html( to_hsl( interp( cl.scales['11']['qual']['Paired'], 5000 ) ) ) )

All colors in cl.scales

# (in IPython notebook)
from IPython.display import HTML
HTML(cl.to_html( cl.scales ))

colorlover's Issues

cl.interp throwing "IndexError: list index out of range"

Trying to use cl.interp function. It throws an IndexError depending on the length of the new color list.
Steps to reproduce:

>>> colors = ['rgb(27,158,119)',
 'rgb(217,95,2)',
 'rgb(117,112,179)',
 'rgb(231,41,138)',
 'rgb(102,166,30)',
 'rgb(230,171,2)',
 'rgb(166,118,29)']
>>> works = cl.interp(colors, 10)
>>> fails = cl.interp(colors, 11)
/usr/local/lib/python2.7/dist-packages/colorlover/__init__.pyc in interp(scl, r)
   1821         c_i = int(i*math.floor(SCL_FI)/round(r[-1])) # start color index
   1822         hsl_o = rgb_to_hsl( scl[c_i] ) # convert rgb to hls
-> 1823         hsl_f = rgb_to_hsl( scl[c_i+1] )
   1824         section_min = c_i*r[-1]/SCL_FI
   1825         section_max = (c_i+1)*(r[-1]/SCL_FI)

IndexError: list index out of range

The problem is that c_i can round to len(scl)-1 depending on the length of r, hence scl[c_i+1] will end up being out of bounds. A naive solution would imply checking for that specific corner case (I'm sure there's a more elegant way though).

flipper doesn't invert

Nice library- but I find that flipper doesn't really invert the colours.

List index out of range in call to interp with certain bin counts

When trying to interpolate a 9-color divergent ramp to 32 bins, I noticed a 'list index out of range' error being thrown on line 1823 of init.py. Intrigued, I ran a loop to see which bin counts worked and which didn't. Those results are posted in the space below.

If this is an expected behavior, a better error message should be thrown. If this is a bug, it will need to be investigated.

Error message:

yc in interp(scl, r)
    1821         c_i = int(i*math.floor(SCL_FI)/round(r[-1])) # start color index
    1822         hsl_o = rgb_to_hsl( scl[c_i] ) # convert rgb to hls
 -> 1823         hsl_f = rgb_to_hsl( scl[c_i+1] )
    1824         section_min = c_i*r[-1]/SCL_FI
    1825         section_max = (c_i+1)*(r[-1]/SCL_FI)

Test code:

for i in xrange(1, 1000):
    try:
        scale = cl.interp(cl.scales["9"]["div"]["RdBu"], i)
    except:
        print "{0}. Failed".format(i)
    else:
        print "{0}. Passed".format(i)

1. Failed
2. Failed
3. Failed
4. Failed
5. Failed
6. Passed
7. Passed
8. Passed
9. Passed
10. Passed
11. Failed
12. Failed
13. Failed
14. Failed
15. Failed
16. Passed
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20. Passed
21. Failed
22. Failed
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24. Failed
25. Failed
26. Passed
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30. Passed
31. Failed
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35. Failed
36. Passed
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41. Failed
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46. Passed
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51. Failed
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55. Failed
56. Passed
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61. Failed
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998. Passed
999. Passed

interp giving weird intermediate values?

I'm playing around with interp, and it seems to give some weird intermediate values. For example, in the docs for colorlover there is a section of the 'BuPu' colormap that cycles through hues early on:

I've found similar things when doing this with my own colormaps, e.g.:

This doesn't seem to be as big of a problem w/ fewer bins:

Any idea what's going on?

`interp` doesn't smooth colours properly

Using python 3.6 / colorlover 0.2.1

Expecting a smooth transition from white to deep red, instead there's rainbow colour in the middle of the list, as shown below

use in Plots.jl?

I don't see a license in the repo. How would you feel about contributing the color dictionary to Plots.jl so that these gradients could be used for all backends (including Plotly)?

nbviewer links in the README give a 400 error

Both nbviewer links don't work for me.

Include plotly.js default colors in colorlover

I would find useful to have plotly.js default colors (see https://stackoverflow.com/a/44727682) available in python. In a previous discussion at plotly, we suggested the right place for the color scale could be the colorlover package. Do you agree? Thanks

colorlover has no license

I noticed that the colorlover package has no license file or license declaration in setup.py. Is it intended to be under MIT like plot.ly? If so, could you clarify that by adding a license file.

cl.interp (and others) does not allow np.array for color scale

Would be nice if this awesome library would allow creating color scales from numpy arrays.
Right now it only detects numeric color scale if it strictly consists of tuples (explicit check in scale_type).

Avoid negative HSL angle values

See plotly/plotly.py#1212

Though it is technically valid (https://www.w3.org/wiki/CSS3/Color/HSL), it would be helpful if colorlover didn't produce HSL color values with negative angles (e.g. 'hsl(-5, 37%, 73%)'), but instead wrapped these angles into the interval [0, 360] (e.g. 'hsl(355, 37%, 73%)' in the case above). These negative HSL values are not supported by the tinycolor2 library that Plotly.js relies on for color handling. See plotly/plotly.py#1212 (comment) for more details.

Here's an example that produces negative hsl angle values

import colorlover as cl
markercl = cl.scales['11']['qual']['Paired']
cl.interp(markercl, 16)

['hsl(76.0, 52.0%, 77.0%)',
 'hsl(157.33333333333334, 64.0%, 53.0%)',
 'hsl(162.33333333333331, 65.66666666666666%, 50.66666666666667%)',
 'hsl(90.99999999999996, 56.99999999999999%, 70.00000000000001%)',
 'hsl(107.66666666666669, 56.333333333333336%, 49.999999999999986%)',
 'hsl(124.33333333333334, 55.666666666666664%, 29.999999999999986%)',
 'hsl(-7.105427357601002e-14, 92.00000000000003%, 79.00000000000003%)',
 'hsl(-77.33333333333343, 116.00000000000003%, 105.00000000000003%)',
 'hsl(478.66666666666674, 74.66666666666666%, 38.99999999999999%)',
 'hsl(718.0, 66.0%, 19.0%)',
 'hsl(-184.3333333333336, 109.00000000000001%, 85.66666666666669%)',
 'hsl(-401.6666666666673, 121.00000000000003%, 100.33333333333337%)',
 'hsl(24.999999999999996, 103.0%, 28.99999999999998%)',
 'hsl(22.333333333333336, 105.0%, 15.0%)',
 'hsl(-59.66666666666674, -63.33333333333346%, 110.66666666666671%)',
 'hsl(-85.00000000000006, -110.00000000000009%, 128.00000000000003%)']

divid by 0 in interp()

The following code

import colorlover as cl
cl.interp( cl.scales['3']['div']['RdYlBu'], 5) 

generates:

---------------------------------------------------------------------------
ZeroDivisionError                         Traceback (most recent call last)
<ipython-input-8-14a39fa30bf3> in <module>()
      1 import colorlover as cl
----> 2 cl.interp( cl.scales['3']['div']['RdYlBu'], 5)

/Users/garyfeng/anaconda/lib/python2.7/site-packages/colorlover/__init__.py in interp(scl, r)
   1821         # garyfeng: c_i could be rounded up so scl[c_i+1] will go off range
   1822         #c_i = int(i*math.floor(SCL_FI)/round(r[-1])) # start color index
-> 1823         c_i = int(math.floor(i*math.floor(SCL_FI)/round(r[-1]))) # start color index
   1824         hsl_o = rgb_to_hsl( scl[c_i] ) # convert rgb to hls
   1825         hsl_f = rgb_to_hsl( scl[c_i+1] ) if c_i < len(scl)-1 else hsl_o

ZeroDivisionError: float division by zero

Apparently round(r[-1])==0.

cl.flipper( scale=None ) seems not working

Dear developers of colorlover tool,
I was trying to reverse the colors of "Spectral" in the Diverging category. I thought the function cl.flipper( scale=None ) could achieve this. However, it didn't. From your GitHub webpage, the results of cl.flipper()['div']['3']['RdYlBu'] and cl.scales['3']['div']['RdYlBu'] are the same, the same sequence of the three returned rgb combinations. This perhaps explains why I didn't see reverse Spectral. I tried cl.scales['3']['div']['Spectral_r'], i.e., by adding _r, and it didn't work either. I am not sure if this is a problem or not. Could you please teach me how to reverse the color scale of your tool? Thank you in advance for your insights.

Last color patch out of alignment when HTML is displayed in JupyterLab

When displaying a colorscale using cl.to_html in JupyterLab the last color square is out of alignment with the rest.

Add Types?

We have recently introduced this package to are project and noticed that there are no type hints. I would have done it myself, but I found that there is no actual code in the repo.

It should be a fairly straightforward task (maybe not if you continue to support python versions < 3).

Specify license in setup.py

It would be useful if the license used could also be specified in setup.py, as then it can be displayed correctly by pip-licenses. This would involve a change like:

 setup(
     ...
+    license='MIT',
     ...

colorlover notebook no longer on plotly website?

Perhaps more of an issue with plotly's website but the README points to this page (https://plot.ly/ipython-notebooks/color-scales/) which used to be a notebook of helpful lists of all of the palettes in colorlover

However that link now redirects to here: (https://plotly.com/python/builtin-colorscales/) and none of colorlovers palettes or features are listed.

Is there a way to get access to the old notebook somehow?

Thanks!

Conversion to hex?

Great library, but finding I need to use a second library (or annoying string parsing function) to convert the hsl or rgb's to hex, which is needed for things like tkinter. Possible to add a to_hex() method?

Convenience scale getter

This library is awesome. I am wondering if you would be interested in a convenience function for getting the scale by name. It takes a little bit to inspect the dict to get the relevant scheme. A simple function that handles the scanning and integer conversion, with some helpful error messages, would make this super-usable. Something like

cl.get_scale('Purples', 10)
cl.get_scale('PuGr') # defaults to 5 divs

I'd be happy to code something up if you were willing to merge.

Interpolation bug

cl.interp(cl.scales['9']['seq']['Reds'], 100) #Works
cl.interp(cl.scales['9']['seq']['Reds'], 101) #Exception
cl.interp(cl.scales['9']['seq']['Reds'], 110) #Works

I don't see why this should happen.