vanzelfsprekend

Palettes

Paul Tol's colourblind-safe schemes and the neutral inks: cycle installs a scheme as the axes' colour cycle, and the constants are the schemes and inks it draws on.

palettes

Paul Tol's qualitative colour schemes, and vanzelfsprekend's inks.

Transcribed from Paul Tol, "Colour Schemes", SRON/EPS/TN/09-002, issue 3.2, 18 August 2021 (https://sronpersonalpages.nl/~pault/). Each scheme is ordered by the technote's recommended fixed picking sequence; list(SCHEME.values()) is the colour-cycle form. PALE and DARK are meant for text backgrounds and text, not for lines or maps; their colour names drop the technote's redundant scheme prefix, so the colour is blue, reached as tol:dark.blue, not tol:dark.dark_blue.

The three inks -- DATA_INK, TEXT_INK, LINE_INK -- are roles, not a scheme: a grey value hierarchy for the marks, the text and the frame. cycle turns a chosen scheme, or the neutral ink, into a colour cycle.

DATA_INK module-attribute 

DATA_INK = '#333333'

TEXT_INK module-attribute 

TEXT_INK = DARK['grey']

LINE_INK module-attribute 

LINE_INK = '#999999'

SCHEMES module-attribute 

SCHEMES = {
    "bright": BRIGHT,
    "high_contrast": HIGH_CONTRAST,
    "vibrant": VIBRANT,
    "muted": MUTED,
    "medium_contrast": MEDIUM_CONTRAST,
    "pale": PALE,
    "dark": DARK,
    "light": LIGHT,
}

BRIGHT module-attribute 

BRIGHT = {
    "blue": "#4477AA",
    "red": "#EE6677",
    "green": "#228833",
    "yellow": "#CCBB44",
    "cyan": "#66CCEE",
    "purple": "#AA3377",
    "grey": "#BBBBBB",
}

HIGH_CONTRAST module-attribute 

HIGH_CONTRAST = {
    "blue": "#004488",
    "yellow": "#DDAA33",
    "red": "#BB5566",
}

VIBRANT module-attribute 

VIBRANT = {
    "orange": "#EE7733",
    "blue": "#0077BB",
    "cyan": "#33BBEE",
    "magenta": "#EE3377",
    "red": "#CC3311",
    "teal": "#009988",
    "grey": "#BBBBBB",
}

MUTED module-attribute 

MUTED = {
    "rose": "#CC6677",
    "indigo": "#332288",
    "sand": "#DDCC77",
    "green": "#117733",
    "cyan": "#88CCEE",
    "wine": "#882255",
    "teal": "#44AA99",
    "olive": "#999933",
    "purple": "#AA4499",
    "pale_grey": "#DDDDDD",
}

MEDIUM_CONTRAST module-attribute 

MEDIUM_CONTRAST = {
    "light_blue": "#6699CC",
    "dark_blue": "#004488",
    "light_yellow": "#EECC66",
    "dark_red": "#994455",
    "dark_yellow": "#997700",
    "light_red": "#EE99AA",
}

PALE module-attribute 

PALE = {
    "blue": "#BBCCEE",
    "cyan": "#CCEEFF",
    "green": "#CCDDAA",
    "yellow": "#EEEEBB",
    "red": "#FFCCCC",
    "grey": "#DDDDDD",
}

DARK module-attribute 

DARK = {
    "blue": "#222255",
    "cyan": "#225555",
    "green": "#225522",
    "yellow": "#666633",
    "red": "#663333",
    "grey": "#555555",
}

LIGHT module-attribute 

LIGHT = {
    "light_blue": "#77AADD",
    "orange": "#EE8866",
    "light_yellow": "#EEDD88",
    "pink": "#FFAABB",
    "light_cyan": "#99DDFF",
    "mint": "#44BB99",
    "pear": "#BBCC33",
    "olive": "#AAAA00",
    "pale_grey": "#DDDDDD",
}

cycle 

cycle(scheme: str = 'ink') -> Cycler

Build a colour cycle for ax.set_prop_cycle, keyed by drawing intent.

The default "ink" gives a one-colour cycle of DATA_INK, so every mark drawn under it is neutral ink: reach for it when colour carries nothing, as with a lone series. Any SCHEMES key gives that scheme's colours in the technote's picking order, dropping its bad-data grey (grey/pale_grey), which is not a series colour: reach for a scheme only once colour distinguishes the series.