[pygame] Best way to darken an area

Hello all

Anyone of you is experienced in darkening an area from daytime to nighttime?

- Alpha filter?
- Setting image pixels to darker value?
- ???

I couldn't find anything affecting contrast in Pygame that would help either.

Any ideas are welcome.

Greetings

Farai

Follow-Ups:
- Re: [pygame] Best way to darken an area
  - From: Lenard Lindstrom
- Re: [pygame] Best way to darken an area
  - From: Patrick Mullen
- Re: [pygame] Best way to darken an area
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References:
- [pygame] GLSL Texturing example ? (and ctypes...?)
  - From: JoN
- Re: [pygame] GLSL Texturing example ? (and ctypes...?)
  - From: Simon Wittber
- Re: [pygame] GLSL Texturing example ? (and ctypes...?)
  - From: JoN
- Re: [pygame] GLSL Texturing example ? (and ctypes...?)
  - From: Simon Wittber
- Re: [pygame] GLSL Texturing example ? (and ctypes...?)
  - From: JoN
- Re: [pygame] GLSL Texturing example ? (and ctypes...?)
  - From: Alex Holkner
- Re: [pygame] GLSL Texturing example ? (and ctypes...?)
  - From: JoN
- Re: [pygame] GLSL Texturing example ? (and ctypes...?)
  - From: Alex Holkner
- Re: [pygame] GLSL Texturing example ? (and ctypes...?)
  - From: JoN
- Re: [pygame] GLSL Texturing example ? (and ctypes...?)
  - From: Alex Holkner