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Old 08-06-2016, 09:40 AM   #4
Jellby
frumious Bandersnatch
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Posts: 7,559
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Join Date: Jan 2008
Location: Spaniard in Sweden
Device: Cybook Orizon, Kobo Aura
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.
Attached Thumbnails
Click image for larger version

Name:	levels.png
Views:	523
Size:	4.5 KB
ID:	150712   Click image for larger version

Name:	015 -_(2).jpg
Views:	510
Size:	246.8 KB
ID:	150713   Click image for larger version

Name:	015 -_(3).jpg
Views:	491
Size:	119.4 KB
ID:	150714   Click image for larger version

Name:	015 -_(4).png
Views:	499
Size:	112.5 KB
ID:	150715   Click image for larger version

Name:	225 -_(2).jpg
Views:	514
Size:	245.6 KB
ID:	150716   Click image for larger version

Name:	225 -_(3).jpg
Views:	496
Size:	119.8 KB
ID:	150717   Click image for larger version

Name:	225 -_(4).png
Views:	504
Size:	104.1 KB
ID:	150718  
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