Question 1

How many colors can a categorical chart palette have and still be colorblind-safe?

Accepted Answer

Up to about six. Beyond that, some pairs inevitably collapse for red-green colorblind viewers (about 8% of men). The generator reports the minimum perceptual distance under protanopia and deuteranopia simulation and warns when you should add shapes, patterns or labels.

Question 2

What is the difference between sequential and diverging palettes?

Accepted Answer

Sequential palettes run from light to dark in one hue and encode a single increasing quantity, such as population density. Diverging palettes run from one color through a neutral midpoint to a second color and encode values that deviate from a meaningful center, such as temperature anomaly or profit and loss.

Question 3

How do I use a custom color palette in matplotlib or seaborn?

Accepted Answer

Pass a list of hex strings: set matplotlib's axes.prop_cycle to a cycler of your colors, or call seaborn.set_palette(list). For continuous data, build a colormap with LinearSegmentedColormap.from_list or seaborn.blend_palette. The export tab gives ready-to-paste code.

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Chart Palette Generator

Chart Palette Generator