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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 (0 < u < 255 and 0 < v < 255)

camera.color_effects = (u, v)

contrast (-100 < u < 100)

camera.contrast = -i

crop (0.0 - 1.0)

for i in range(100):
  zoom = i / 100.0
  zoom1 = 1.0 - zoom
  camera.crop = (zoom, zoom, zoom1, zoom1)
  

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()