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Scale by ceil(max_raw / 256) to prevent out of range colour values #146

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Scale by ceil(max_raw / 256) to prevent out of range colour values #146

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6 changes: 5 additions & 1 deletion sense_hat/colour.py
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Original file line number Diff line number Diff line change
Expand Up @@ -316,6 +316,10 @@ def get_raw(self):
get_clear = _raw_wrapper(CDATA)


def ceildiv(a, b):
return -(a // -b)


class ColourSensor:

def __init__(self, gain=1, integration_cycles=1, interface=I2C):
Expand Down Expand Up @@ -376,7 +380,7 @@ def colour_raw(self):

@property
def _scaling(self):
return self.max_raw // 256
return ceildiv(self.max_raw, 256)

@property
def colour(self):
Expand Down