penguin86/lumos
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Shutter speed and aperture functions

Browse Source
This commit is contained in:
Daniele Verducci 2024-04-30 07:52:16 +02:00
parent 5e557cc29f
commit 5273206c33
1 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/ev_calculator.py
View File

@ -1,4 +1,4 @@
from math import log
from math import log, sqrt
'''
This class does all the required math. It is based on the Wikipedia page
@ -17,8 +17,13 @@ class EVCalculator:
K = 12.5 # TODO: Add to settings?
def luxToEV(lux: float) -> float:
# Wikipedia (https://en.wikipedia.org/wiki/Exposure_value#EV_as_a_measure_of_luminance_and_illuminance)
# Wikipedia (https://en.wikipedia.org/wiki/Light_meter#Exposure_equations)
# says E = 2.5 * (2^EV), so the inverse is EV = ln(2*E/5)/ln(2)
return log(2*lux/5, 2)
def calcShutterSpeed(isoSpeed: int, lux: float, aperture: float):
return ((aperture^2)*K)/(lux*isoSpeed)
def calcAperture(isoSpeed: int, lux: float, shutterSpeed: float):
return sqrt(lux*isoSpeed*shutterSpeed/K)