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authorMattias Andrée <maandree@operamail.com>2014-02-17 00:41:13 +0100
committerMattias Andrée <maandree@operamail.com>2014-02-17 00:41:13 +0100
commit8ab9713792002905f336a509291b4af6c146c60a (patch)
tree086639e1a24c886e3286e3697865b488d89d77ee /src/curve.py
parentthe tempurations are actually correct, suggest in doc to use divide_by_maximum (diff)
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add tempurature mappings from redshift
Signed-off-by: Mattias Andrée <maandree@operamail.com>
Diffstat (limited to 'src/curve.py')
-rw-r--r--src/curve.py57
1 files changed, 54 insertions, 3 deletions
diff --git a/src/curve.py b/src/curve.py
index 74beb41..4c05822 100644
--- a/src/curve.py
+++ b/src/curve.py
@@ -58,6 +58,8 @@ def series_d(temperature):
'''
Calculate the colour for a blackbody temperature
+ Using `lambda t : divide_by_maximum(series_d(t))` as the algorithm is better than just `series_d`
+
@param temperature:float The blackbody temperature in kelvins, must be inside [4000, 7000]
@return :(float, float, float) The red, green and blue components of the white point
'''
@@ -68,7 +70,7 @@ def series_d(temperature):
for (k, d) in ks:
x += k * 10 ** (d * 3) / temperature ** d
y = 2.870 * x - 3.000 * x ** 2 - 0.275
- return ciexy_to_srgb(x, y, 1.0)
+ return ciexyy_to_srgb(x, y, 1.0)
def simple_whitepoint(temperature):
@@ -98,7 +100,7 @@ def cmf_2deg(temperature):
'''
Calculate the colour for a blackbody temperature using raw CIE 1931 2 degree CMF data with interpolation
- Using `lambda t : divide_by_maximum(cmf_2deg(t))` as the colour algorithm is better than just `cmf_2deg`
+ Using `lambda t : divide_by_maximum(cmf_2deg(t))` as the algorithm is better than just `cmf_2deg`
@param temperature:float The blackbody temperature in kelvins, clipped to [1000, 40000]
@return :(float, float, float) The red, green and blue components of the white point
@@ -129,7 +131,7 @@ def cmf_10deg(temperature):
'''
Calculate the colour for a blackbody temperature using raw CIE 1964 10 degree CMF data with interpolation
- Using `lambda t : divide_by_maximum(cmf_10deg(t))` as the colour algorithm is better than just `cmf_10deg`
+ Using `lambda t : divide_by_maximum(cmf_10deg(t))` as the algorithm is better than just `cmf_10deg`
@param temperature:float The blackbody temperature in kelvins, clipped to [1000, 40000]
@return :(float, float, float) The red, green and blue components of the white point
@@ -155,6 +157,54 @@ def cmf_10deg(temperature):
return ciexyy_to_srgb(x, y, 1)
+redshift_cache, redshift_old_cache = None, None
+def redshift(temperature, old_version = False, linear_interpolation = False):
+ '''
+ Calculate the colour for a blackbody temperature using same data as in the program redshift
+
+ @param temperature:float The blackbody temperature in kelvins, clipped to [1000, 25100] (100 more kelvins than in redshift)
+ @param old_version:bool Whether to the method used in redshift<=1.8, in which case
+ `temperature` is clipped to [1000, 10000] (1 more kelvin than in redshift)
+ @param linear_interpolation:bool Whether to interpolate one linear RGB instead of sRGB
+ @return :(float, float, float) The red, green and blue components of the white point
+ '''
+ global redshift_cache, redshift_old_cache
+ cache = None
+ if not old_version:
+ if redshift_cache is None:
+ with open(DATADIR + '/redshift', 'rb') as file:
+ redshift_cache = file.read()
+ redshift_cache = redshift_cache.decode('utf-8', 'error').split('\n')
+ redshift_cache = filter(lambda x : not x == '', redshift_cache)
+ redshift_cache = [[float(x) for x in r_g_b.split(' ')] for r_g_b in redshift_cache]
+ cache = redshift_cache
+ else:
+ if redshift_old_cache is None:
+ with open(DATADIR + '/redshift_old', 'rb') as file:
+ redshift_old_cache = file.read()
+ redshift_old_cache = redshift_old_cache.decode('utf-8', 'error').split('\n')
+ redshift_old_cache = filter(lambda x : not x == '', redshift_old_cache)
+ redshift_old_cache = [[float(x) for x in r_g_b.split(' ')] for r_g_b in redshift_old_cache]
+ cache = redshift_old_cache
+ temp = min(max(1000, temperature), 10000 if old_version else 25100)
+ r, g, b = 1, 1, 1
+ if (temp % 100) == 0:
+ (r, g, b) = cache[(temp - 1000) // 100]
+ else:
+ temp -= 1000
+ (r1, g1, b1) = cache[temp // 100]
+ (r2, g2, b2) = cache[temp // 100 + 1]
+ temp = (temp % 100) / 100
+ if linear_interpolation:
+ (r, g, b) = standard_to_linear(r, g, b)
+ r = r1 * temp + r2 * (1 - temp)
+ g = g1 * temp + g2 * (1 - temp)
+ b = b1 * temp + b2 * (1 - temp)
+ if linear_interpolation:
+ (r, g, b) = linear_to_standard(r, g, b)
+ return (r, g, b)
+
+
def temperature(temperature, algorithm):
'''
@@ -166,6 +216,7 @@ def temperature(temperature, algorithm):
if temperature == 6500:
return
(r, g, b) = algorithm(temperature)
+ print(r, g, b)
rgb_brightness(r, g, b)