MobileRead Forums - View Single Post - Mystery and Crime Collins, Wilkie: The Woman in White (Illustrated) v3 18 Mar 2012

SBT · 03-17-2012, 06:16 AM

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

Code:

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:

Code:

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)

03-17-2012, 06:16 AM	#7
SBT Fanatic Posts: 580 Karma: 810184 Join Date: Sep 2010 Location: Norway Device: prs-t1, tablet, Nook Simple, assorted kindles, iPad	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 Code: 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: Code: 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)