Links related to gradation curves and color correction

If you wondered where the word gradation comes from - its origin is Latin: gradus - step. In conjunction with photography it was first used back in the days of analogue photography. Here you can find some things about gradation:
http://en.mimi.hu/photography/gradation.html

Heris' Curves For Absolute Beginners tutorial:
http://forums.virtualdub.org/index.php?act=ST&f=7&t=15165&s=4310bd6d406d0c1029d7575cf536280e

A good tutorial about photoshop curves and how to do color correction with curves:
http://www.zuberphotographics.com/content/photoshop/curves.htm

Also a very good read about photoshop curves and the concept of curves in gerneral:
http://www.cambridgeincolour.com/tutorials/photoshop-curves.htm

Curves on Wikipeda:
http://en.wikipedia.org/wiki/Curve_(tonality)

Information about color spaces in general on Wikipedia:
http://en.wikipedia.org/wiki/Color_space

Information about the Lab color space on Wikipedia:
http://en.wikipedia.org/wiki/Lab_color_space

Information about using the Lab color space for color correction and enhancement:
http://www.dgrin.com/showthread.php?t=18203

Links related to VirtualDub

Home of VirtualDub:
http://www.virtualdub.org/

Home of neuron2:
http://neuron2.net/index.html