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PiCamera

http://picamera.readthedocs.org/en/release-1.4/

Install:

$ sudo apt-get update
$ sudo apt-get install python-picamera

Funktion for Camera Preview:

• color_effects camera.color_effects = (u, v)
• contrast
• crop
• framerate
• hflip
• image_effect
• preview_alpha
• preview_fullscreen
• preview_window
• rotation
• saturation
• vflip
• led

Example:

import time
import picamera
with picamera.PiCamera() as camera:
  camera.start_preview()
  try:
      for j in range(100):
          camera.preview_fullscreen = False
          camera.preview_window = (100-j, 100-j, 1000, 500)
          time.sleep(0.2)
  finally:
      camera.stop_preview()