Sample showing the difference between GRBG and RGGB debayering on Panoptes FITS files.

Histogram Test.ipynb

The image in the example is of a green laser on the night sky captured by a PANOPTES unit. The camera is by Canon and is supposed to use RGGB pixel pattern. However the debayering seems to work properly with GRBG.

Looks like the color is good in the laser. Hard to tell in the sky. I'm not too familiar with PIL, but try image normalization in astropy.visualization. Here's example of code I've used:

from astropy import visualization as v
from matplotlib import pyplot as plt
plt.figure()
norm = v.ImageNormalize(ccd_2001sum, interval=v.PercentileInterval(99), stretch=v.LogStretch(1))
plt.imshow(ccd_2001sum, origin='lower', norm=norm)
plt.show()

You can also try other intervals and stretches.

@joshwalawender, updated the gist to properly distinguish between RGGB and GRBG modes.

Thank you for the code snippet Josh. it will get me upto speed quite quickly.

Clarification The FITS files have the zeroth pixel at the bottom left corner of the array. So first flip the array using np.flipud and then apply RGGB demosaicing which is the pattern used by Canon.