09-04-2017, 08:23 PM 
	
	
	
		As far as I can tell (with the help of Gimp's analysis tools(*)) your brown areas are a uniform color, except on the edges (where pixels are a mix of the two adjacent colors, as usually done for anti-aliasing), and near the edges due to JPEG compression artifacts.
But the core of the areas is uniform. So, what non-brown color do you want to recolor? Because if you recolor the edge pixels, the edges will look pixellated.
(*) Namely
	
	
	
But the core of the areas is uniform. So, what non-brown color do you want to recolor? Because if you recolor the edge pixels, the edges will look pixellated.
(*) Namely
- Make a fuzzy select on the area
 - Shrink the selection to get far enough from 
- the 5x5 pixels due to your zooming in the screen shot
 - The 8x8 "boxes" of the JPEG compression
 
 - the 5x5 pixels due to your zooming in the screen shot
 - Color>Info>Colorcube analysis: "Only one unique color".
 

