Camera saturation results in dark spots

[liuhenry]

background = np.subtract(self.beam, self.dark)
image = np.subtract(self.data, self.dark)
transmission = np.divide(image, background)
transmission[background <= 7] = 1

[liuhenry]

print(background)
None
[[  0   0   0 ... 255 255   0]
 [  0   0   0 ... 255 255   1]
 [  0   0   1 ...   0   1   1]
 ...
 [  0   1   0 ...   0   1   0]
 [  0   0   0 ...   0   1   0]
 [  1   0   0 ... 255   0   0]]
print(image)
None
[[  0   0   0 ...   0   0   1]
 [  0   0   0 ...   0   0   1]
 [  0   0   1 ...   1   1   0]
 ...
 [  0   1   0 ...   0   1   0]
 [255   0   0 ...   0   1   0]
 [  0   1   0 ... 255   1 255]]
print(transmission)
None
[[nan nan nan ...  0.  0. inf]
 [nan nan nan ...  0.  0.  1.]
 [nan nan  1. ... inf  1.  0.]
 ...
 [nan  1. nan ... nan  1. nan]
 [inf nan nan ... nan  1. nan]
 [ 0. inf nan ...  1. inf inf]]

• nan results from 0/0
• inf results from x/0
• transmission values range from 0 to 255, due to discretization

Scenarios

• If a light pixel is 0, there should be no atom signal, but about 1% of atom pixels are like this (due to drift / variance over time?)
• If there are not enough atoms to absorb a strong saturating beam, both the atom picture and the light picture will have saturated pixels, and there is no way to differentiate between this situation and a no atom situation