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			Let's see if this helps. I did this with gimp, which may behave different from photoshop. 
 
015: Changed to greyscale mode. Adjusted levels: input levels from 70 (black) to 230 (white). Saved as JPG with 85% quality (my default). Result: 015 -_(2).jpg, 40% size. Saved as JPG with 30% quality. Result: 015 -_(3).jpg, 19% size. Changed to indexed color mode, 16 maximum levels. Saved as PNG, maximum compression. Result: 015 -_(4).png, 18% size. 
 
225: Same process, but adjusted the levels between 85 and 215. 225 -_(2).jpg: 38%. 225 -_(3).jpg: 19%. 225 -_(4).png: 16%. 
 
I think the 30% quality JPGs are too aggressive and blurry, but the PNGs look quite acceptable.
		 
		
	
		
		
			
		
		
		
		
		
		
		
		
		
		
		
	
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