Darken area spectrum (newbie question)

[hamwizard]

Hi,

 

I don't know how to explain this in graphics people talk

Say I have an area highlighted in an image which contains a gradient of colour, example very light green, light green, green, dark green, very dark green

 

I want to be able to click on this section and deepen the colour so the lightest is no longer 'very light green' but simply, light green ->  ending at very *very* dark green

Does this make sense.

 

Is this easy? I imagine there's probably multiple methods, what woudl be the best.

[toe_head2001]

You could try the 'Conditional Hue/Saturation Adjustment' plugin.

http://forums.getpaint.net/index.php?/topic/13003-evans-effects-open-source-as-of-october-16-2012/