def draw_lab_l_cylinder(image, l):
width, height = image.size
pixels = image.load()
for x in range(width):
hue = interpolate(0, 360, x / width)
for y in range(height):
chroma = interpolate(1.4, 0.0, y / height)
a, b = chroma_hue_to_ab(chroma, hue)
color = Color.NewFromLab(l, a, b)
pixels[x,y] = color_to_ints(color)
def draw_lab_hue_spoke(image, hue):
width, height = image.size
pixels = image.load()
for x in range(width):
chroma = interpolate(-1.5, 1.5, x / width)
for y in range(height):
l = interpolate(99.9, 0.0, y / height)
a, b = chroma_hue_to_ab(chroma, hue)
color = Color.NewFromLab(l, a, b)
pixels[x,y] = color_to_ints(color)
def peak_chroma_color():
"""
What is the color with the highest chroma value?
"""
best_chroma = 0
best_color = None
for lightness in range(0, 100):
for hue in range(0, 360):
chroma = max_chroma(hue, lightness)
if chroma > best_chroma:
best_chroma = chroma
a, b = chroma_hue_to_ab(chroma, hue)
best_color = Color.NewFromLab(lightness, a, b)
return best_color, best_chroma
def draw_cylinder_surface(image):
from limits import max_chroma
width, height = image.size
pixels = image.load()
for x in range(width):
hue = interpolate(0, 360, x / width)
for y in range(height):
l = interpolate(99.9, 0.0, y / height)
chroma = max_chroma(hue, l)
if chroma:
a, b = chroma_hue_to_ab(chroma, hue)
color = Color.NewFromLab(l, a, b)
else:
color = gray
pixels[x,y] = color_to_ints(color)
def valid_for_chroma(chroma):
a, b = chroma_hue_to_ab(chroma, hue)
color = Color.NewFromLab(lightness, a, b)
return color.isLegal
