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This program will help to make advise on adjusting the shooting EV value while you had assign interesting zones from your picture. It is an effort to carry the Zone System and principle of pre-view on digital camera color photography.
Using this program, you should
1. capture a pre-view image first,
2. load it into program,
3. assign the brightest zone, darkest zone with as many interesting zones as you want
then
4. push the "Calculate' button to see how many EV adjustment amount should used for a better result on your photography.

Remember
Zone System is a tool, not a decide to your picture.


Program release history:

20130428 Finish the first version , win7

20131130 Become a open source freeware under GNU GPL v3
               provide Win7 , Linux and MacOS excutable file
Source: readme.txt, updated 2013-12-01