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dank16: ensure contrast against background

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bbedward
2025-08-27 15:04:32 -04:00
parent 0a25b6bc8e
commit 74e64c178d
2 changed files with 130 additions and 40 deletions
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165
matugen/dank16.py
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@@ -12,63 +12,126 @@ def rgb_to_hex(r, g, b):
b = max(0, min(1, b))
return f"#{int(r*255):02x}{int(g*255):02x}{int(b*255):02x}"
def generate_palette(base_color, is_light=False, honor_primary=None):
def luminance(hex_color):
r, g, b = hex_to_rgb(hex_color)
def srgb_to_linear(c):
return c/12.92 if c <= 0.03928 else ((c + 0.055)/1.055) ** 2.4
return 0.2126 * srgb_to_linear(r) + 0.7152 * srgb_to_linear(g) + 0.0722 * srgb_to_linear(b)
def contrast_ratio(hex_fg, hex_bg):
lum_fg = luminance(hex_fg)
lum_bg = luminance(hex_bg)
lighter = max(lum_fg, lum_bg)
darker = min(lum_fg, lum_bg)
return (lighter + 0.05) / (darker + 0.05)
def ensure_contrast(hex_color, hex_bg, min_ratio=4.5, is_light_mode=False):
current_ratio = contrast_ratio(hex_color, hex_bg)
if current_ratio >= min_ratio:
return hex_color
r, g, b = hex_to_rgb(hex_color)
h, s, v = colorsys.rgb_to_hsv(r, g, b)
for step in range(1, 30):
delta = step * 0.02
if is_light_mode:
new_v = max(0, v - delta)
candidate = rgb_to_hex(*colorsys.hsv_to_rgb(h, s, new_v))
if contrast_ratio(candidate, hex_bg) >= min_ratio:
return candidate
new_v = min(1, v + delta)
candidate = rgb_to_hex(*colorsys.hsv_to_rgb(h, s, new_v))
if contrast_ratio(candidate, hex_bg) >= min_ratio:
return candidate
else:
new_v = min(1, v + delta)
candidate = rgb_to_hex(*colorsys.hsv_to_rgb(h, s, new_v))
if contrast_ratio(candidate, hex_bg) >= min_ratio:
return candidate
new_v = max(0, v - delta)
candidate = rgb_to_hex(*colorsys.hsv_to_rgb(h, s, new_v))
if contrast_ratio(candidate, hex_bg) >= min_ratio:
return candidate
return hex_color
def generate_palette(base_color, is_light=False, honor_primary=None, background=None):
r, g, b = hex_to_rgb(base_color)
h, s, v = colorsys.rgb_to_hsv(r, g, b)
palette = []
if is_light:
palette.append("#f8f8f8")
if background:
bg_color = background
palette.append(bg_color)
elif is_light:
bg_color = "#f8f8f8"
palette.append(bg_color)
else:
palette.append("#1a1a1a")
bg_color = "#1a1a1a"
palette.append(bg_color)
red_h = 0.0
if is_light:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(red_h, 0.75, 0.85)))
red_color = rgb_to_hex(*colorsys.hsv_to_rgb(red_h, 0.75, 0.85))
palette.append(ensure_contrast(red_color, bg_color, 4.5, is_light))
else:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(red_h, 0.6, 0.8)))
red_color = rgb_to_hex(*colorsys.hsv_to_rgb(red_h, 0.6, 0.8))
palette.append(ensure_contrast(red_color, bg_color, 4.5, is_light))
green_h = 0.33
if is_light:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(green_h, max(s * 0.9, 0.75), v * 0.6)))
green_color = rgb_to_hex(*colorsys.hsv_to_rgb(green_h, max(s * 0.9, 0.75), v * 0.6))
palette.append(ensure_contrast(green_color, bg_color, 4.5, is_light))
else:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(green_h, max(s * 0.65, 0.5), v * 0.9)))
green_color = rgb_to_hex(*colorsys.hsv_to_rgb(green_h, max(s * 0.65, 0.5), v * 0.9))
palette.append(ensure_contrast(green_color, bg_color, 4.5, is_light))
yellow_h = 0.08
if is_light:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(yellow_h, max(s * 0.85, 0.7), v * 0.7)))
yellow_color = rgb_to_hex(*colorsys.hsv_to_rgb(yellow_h, max(s * 0.85, 0.7), v * 0.7))
palette.append(ensure_contrast(yellow_color, bg_color, 4.5, is_light))
else:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(yellow_h, max(s * 0.5, 0.45), v * 1.4)))
yellow_color = rgb_to_hex(*colorsys.hsv_to_rgb(yellow_h, max(s * 0.5, 0.45), v * 1.4))
palette.append(ensure_contrast(yellow_color, bg_color, 4.5, is_light))
if is_light:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(h, max(s * 0.9, 0.7), v * 1.1)))
blue_color = rgb_to_hex(*colorsys.hsv_to_rgb(h, max(s * 0.9, 0.7), v * 1.1))
palette.append(ensure_contrast(blue_color, bg_color, 4.5, is_light))
else:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(h, max(s * 0.8, 0.6), min(v * 1.6, 1.0))))
blue_color = rgb_to_hex(*colorsys.hsv_to_rgb(h, max(s * 0.8, 0.6), min(v * 1.6, 1.0)))
palette.append(ensure_contrast(blue_color, bg_color, 4.5, is_light))
mag_h = h - 0.03 if h >= 0.03 else h + 0.97
if honor_primary:
hr, hg, hb = hex_to_rgb(honor_primary)
hh, hs, hv = colorsys.rgb_to_hsv(hr, hg, hb)
if is_light:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(hh, max(hs * 0.9, 0.7), hv * 0.85)))
mag_color = rgb_to_hex(*colorsys.hsv_to_rgb(hh, max(hs * 0.9, 0.7), hv * 0.85))
palette.append(ensure_contrast(mag_color, bg_color, 4.5, is_light))
else:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(hh, hs * 0.8, hv * 0.75)))
mag_color = rgb_to_hex(*colorsys.hsv_to_rgb(hh, hs * 0.8, hv * 0.75))
palette.append(ensure_contrast(mag_color, bg_color, 4.5, is_light))
elif is_light:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(mag_h, max(s * 0.75, 0.6), v * 0.9)))
mag_color = rgb_to_hex(*colorsys.hsv_to_rgb(mag_h, max(s * 0.75, 0.6), v * 0.9))
palette.append(ensure_contrast(mag_color, bg_color, 4.5, is_light))
else:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(mag_h, max(s * 0.7, 0.6), v * 0.85)))
mag_color = rgb_to_hex(*colorsys.hsv_to_rgb(mag_h, max(s * 0.7, 0.6), v * 0.85))
palette.append(ensure_contrast(mag_color, bg_color, 4.5, is_light))
cyan_h = h + 0.08
if honor_primary:
if is_light:
palette.append(honor_primary)
else:
palette.append(honor_primary)
palette.append(ensure_contrast(honor_primary, bg_color, 4.5, is_light))
elif is_light:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(cyan_h, max(s * 0.8, 0.65), v * 1.05)))
cyan_color = rgb_to_hex(*colorsys.hsv_to_rgb(cyan_h, max(s * 0.8, 0.65), v * 1.05))
palette.append(ensure_contrast(cyan_color, bg_color, 4.5, is_light))
else:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(cyan_h, max(s * 0.6, 0.5), min(v * 1.25, 0.85))))
cyan_color = rgb_to_hex(*colorsys.hsv_to_rgb(cyan_h, max(s * 0.6, 0.5), min(v * 1.25, 0.85)))
palette.append(ensure_contrast(cyan_color, bg_color, 4.5, is_light))
if is_light:
palette.append("#2e2e2e")
@@ -78,29 +141,43 @@ def generate_palette(base_color, is_light=False, honor_primary=None):
palette.append("#5c6370")
if is_light:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(red_h, 0.6, 0.9)))
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(green_h, max(s * 0.8, 0.7), v * 0.65)))
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(yellow_h, max(s * 0.75, 0.65), v * 0.75)))
bright_red = rgb_to_hex(*colorsys.hsv_to_rgb(red_h, 0.6, 0.9))
palette.append(ensure_contrast(bright_red, bg_color, 3.0, is_light))
bright_green = rgb_to_hex(*colorsys.hsv_to_rgb(green_h, max(s * 0.8, 0.7), v * 0.65))
palette.append(ensure_contrast(bright_green, bg_color, 3.0, is_light))
bright_yellow = rgb_to_hex(*colorsys.hsv_to_rgb(yellow_h, max(s * 0.75, 0.65), v * 0.75))
palette.append(ensure_contrast(bright_yellow, bg_color, 3.0, is_light))
if honor_primary:
hr, hg, hb = hex_to_rgb(honor_primary)
hh, hs, hv = colorsys.rgb_to_hsv(hr, hg, hb)
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(hh, min(hs * 1.1, 1.0), min(hv * 1.2, 1.0))))
bright_blue = rgb_to_hex(*colorsys.hsv_to_rgb(hh, min(hs * 1.1, 1.0), min(hv * 1.2, 1.0)))
palette.append(ensure_contrast(bright_blue, bg_color, 3.0, is_light))
else:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(h, max(s * 0.8, 0.7), min(v * 1.3, 1.0))))
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(mag_h, max(s * 0.9, 0.75), min(v * 1.25, 1.0))))
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(cyan_h, max(s * 0.75, 0.65), min(v * 1.25, 1.0))))
bright_blue = rgb_to_hex(*colorsys.hsv_to_rgb(h, max(s * 0.8, 0.7), min(v * 1.3, 1.0)))
palette.append(ensure_contrast(bright_blue, bg_color, 3.0, is_light))
bright_mag = rgb_to_hex(*colorsys.hsv_to_rgb(mag_h, max(s * 0.9, 0.75), min(v * 1.25, 1.0)))
palette.append(ensure_contrast(bright_mag, bg_color, 3.0, is_light))
bright_cyan = rgb_to_hex(*colorsys.hsv_to_rgb(cyan_h, max(s * 0.75, 0.65), min(v * 1.25, 1.0)))
palette.append(ensure_contrast(bright_cyan, bg_color, 3.0, is_light))
else:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(red_h, 0.45, min(1.0, 0.9))))
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(green_h, max(s * 0.5, 0.4), min(v * 1.5, 0.9))))
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(yellow_h, max(s * 0.4, 0.35), min(v * 1.6, 0.95))))
bright_red = rgb_to_hex(*colorsys.hsv_to_rgb(red_h, 0.45, min(1.0, 0.9)))
palette.append(ensure_contrast(bright_red, bg_color, 3.0, is_light))
bright_green = rgb_to_hex(*colorsys.hsv_to_rgb(green_h, max(s * 0.5, 0.4), min(v * 1.5, 0.9)))
palette.append(ensure_contrast(bright_green, bg_color, 3.0, is_light))
bright_yellow = rgb_to_hex(*colorsys.hsv_to_rgb(yellow_h, max(s * 0.4, 0.35), min(v * 1.6, 0.95)))
palette.append(ensure_contrast(bright_yellow, bg_color, 3.0, is_light))
if honor_primary:
hr, hg, hb = hex_to_rgb(honor_primary)
hh, hs, hv = colorsys.rgb_to_hsv(hr, hg, hb)
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(hh, min(hs * 1.2, 1.0), min(hv * 1.1, 1.0))))
bright_blue = rgb_to_hex(*colorsys.hsv_to_rgb(hh, min(hs * 1.2, 1.0), min(hv * 1.1, 1.0)))
palette.append(ensure_contrast(bright_blue, bg_color, 3.0, is_light))
else:
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(h, max(s * 0.6, 0.5), min(v * 1.5, 0.9))))
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(mag_h, max(s * 0.7, 0.6), min(v * 1.3, 0.9))))
palette.append(rgb_to_hex(*colorsys.hsv_to_rgb(h + 0.02 if h + 0.02 <= 1.0 else h + 0.02 - 1.0, max(s * 0.6, 0.5), min(v * 1.2, 0.85))))
bright_blue = rgb_to_hex(*colorsys.hsv_to_rgb(h, max(s * 0.6, 0.5), min(v * 1.5, 0.9)))
palette.append(ensure_contrast(bright_blue, bg_color, 3.0, is_light))
bright_mag = rgb_to_hex(*colorsys.hsv_to_rgb(mag_h, max(s * 0.7, 0.6), min(v * 1.3, 0.9)))
palette.append(ensure_contrast(bright_mag, bg_color, 3.0, is_light))
bright_cyan = rgb_to_hex(*colorsys.hsv_to_rgb(h + 0.02 if h + 0.02 <= 1.0 else h + 0.02 - 1.0, max(s * 0.6, 0.5), min(v * 1.2, 0.85)))
palette.append(ensure_contrast(bright_cyan, bg_color, 3.0, is_light))
if is_light:
palette.append("#1a1a1a")
@@ -111,7 +188,7 @@ def generate_palette(base_color, is_light=False, honor_primary=None):
if __name__ == "__main__":
if len(sys.argv) < 2:
print("Usage: dank16.py <hex_color> [--light] [--kitty] [--honor-primary HEX]", file=sys.stderr)
print("Usage: dank16.py <hex_color> [--light] [--kitty] [--honor-primary HEX] [--background HEX]", file=sys.stderr)
sys.exit(1)
base = sys.argv[1]
@@ -133,7 +210,19 @@ if __name__ == "__main__":
print("Error: --honor-primary requires a hex color", file=sys.stderr)
sys.exit(1)
colors = generate_palette(base, is_light, honor_primary)
background = None
if "--background" in sys.argv:
try:
bg_idx = sys.argv.index("--background")
if bg_idx + 1 < len(sys.argv):
background = sys.argv[bg_idx + 1]
if not background.startswith('#'):
background = '#' + background
except (ValueError, IndexError):
print("Error: --background requires a hex color", file=sys.stderr)
sys.exit(1)
colors = generate_palette(base, is_light, honor_primary, background)
if is_kitty:
# Kitty color format mapping