Steps: 8
Difficulty: 7/10
Translatable?: maybe not
1
>
Levels(Colors > Levels)
Input Levels:
25 ,1.30,255
Output Levels
10 ,240
2
>
Make a new layer(Shift + ctrl + n ) and fill it with #542002,set it to screen at 100%, duplicate it and set this second one to substract at 50%
3
>
Copy visible(shift + ctrl + alt) and paste it on the top of everything (ctrl+v).
Hue/Saturation:
Hue: 0
Lightness:0
Saturation:30
I use 30 for this but for other icons you might need to use less or more saturation,depending on the colours of your base,though I dont suggest more than 50.
4
>
Color Balance ( Colors > Color Balance)
Midtones:15,-2,0
5
>
Channel Mixer ( Colors > Components > Channel Mixer)
Uncheck "Preserve Luminosity" and "Monochrome"
Red:
130,-20,-15
Green:
-10,110,10
Blue:
-35,25,120
6
>
New Layer (Shift + ctrl + n ) fill with #d9e19f set it to substract at 20%
7
>
Duplicate your base,drag it to the top and set it to Soft Light at 50%
8
>
Merge everything (ctrl+m) and sharpen( Filters > Enchance > Sharpen).
Other examples: