[AlexBell]

Originally Posted by SBT

Nice work.
I've fiddled a bit with b&w print illustrations in ebooks; I like to get the background white instead of the light grey that the original scans normally have. I use Imagemagick, so I can do batch operations on all images at once, get fairly decent results. If you run the images through

convert file.png -level 20%,85% new-file.png

you get a white background and clearer black lines. You can also sharpen the images a bit, if you like:

convert file.png -level 20%,85% -unsharp 0.7x0.7+3+0 new-file.png

(That's the parameters I found worked for the images in this book)

Thanks, SBT. That's an interesting suggestion. I'll have a look at Imagemagick.