`:bone` colormap seems wrong

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
julia
Domain
data-visualization

Research direction

No file or test is named. Locate the :bone colormap definition, compare its channel data with Matplotlib's colormap, and determine the intended mapping; done when the discrepancy and expected behavior are confirmed and the relevant definition or tests reflect that decision.

Written by the indexing model from the issue text.

Description

Here, the bone colormap is a straight grayscale white-to-black map, but Matplotlib gives it a blue tinge.

_bone_data = {'red':   ((0., 0., 0.),
                        (0.746032, 0.652778, 0.652778),
                        (1.0, 1.0, 1.0)),
              'green': ((0., 0., 0.),
                        (0.365079, 0.319444, 0.319444),
                        (0.746032, 0.777778, 0.777778),
                        (1.0, 1.0, 1.0)),
              'blue':  ((0., 0., 0.),
                        (0.365079, 0.444444, 0.444444),
                        (1.0, 1.0, 1.0))}

Is there a particular reason we sampled the colormaps here and did not translate Matplotlib's colormaps directly?

Dominant language
Julia
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