default-cmap-resolution (#1200)

* Update _colors.py

* Update CHANGELOG.md

Author: ddkohler

CHANGELOG.md

@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/).
 
 ## [Unreleased]
 
+### Changed
+- default colorbar is sampled at 4096 points (was 256)
+
 ## [3.5.5]
 
 ### Fixed

WrightTools/artists/_colors.py

@@ -424,7 +424,7 @@ def __getitem__(self, key):
 colormaps = cmapdict()
 
 colormaps["cubehelix"] = copy.copy(plt.get_cmap("cubehelix_r"))
-colormaps["default"] = cubehelix
+colormaps["default"] = cubehelix.resampled(2**12)
 colormaps["signed"] = copy.copy(plt.get_cmap("bwr"))
 colormaps["greenscale"] = mplcolors.LinearSegmentedColormap.from_list("greenscale", greenscale)
 colormaps["greyscale"] = mplcolors.LinearSegmentedColormap.from_list("greyscale", greyscale)