sightmachine/SimpleCV — pull request #494 by salil93 (2013-04-29 22:51:40+00:00)
Title: Average Luminosity Lightness methods implemented.

Methods for Average, Luminosity and Lightness methods implemented.

Example:

img = Image('lenna')
i1 = img.getAverage()
![avg](https://f.cloud.github.com/assets/1548906/441558/f03fcda8-b11e-11e2-97ba-142c5c95a824.png)

i2 = img.getLightness()
![light](https://f.cloud.github.com/assets/1548906/441561/f6dd3862-b11e-11e2-8882-7ce38f50da57.png)

i3 = img.getLuminosity()
![luminosity](https://f.cloud.github.com/assets/1548906/441562/0307b7d4-b11f-11e2-847a-5bc9536cb3ff.png)

Issue #492