Python Forum

I'd use Pandas, largely as it is simple to select data according to your preference.

import pandas as pd

sky = [[20,20,150,200,230],[21,20,0,0,0],[22,20,100,110,90],[23,20,200,220,220],[24,20,210,210,210]]
colnames = ['x','y','red','green','blue']
df = pd.DataFrame(sky,columns=colnames)
df.head()

Output:
	x	y	red	green	blue
0	20	20	150	200	230
1	21	20	0	0	0
2	22	20	100	110	90
3	23	20	200	220	220
4	24	20	210	210	210

This sets up the dataframe with columns for x and y coordinates and columns for the RGB readings of the pixels. Selecting bright ones is then simple as

dfbright = df[df.red+df.green+df.blue > 600]
dfbright.head()

Output:
	x	y	red	green	blue
3	23	20	200	220	220
4	24	20	210	210	210