Voyage have 1072x1448 screen.
KCC was created to convert full page manga/comics and webtoons. You can experiment with other type of input but as you can see - output might (and probably will) be bad.
By default KCC is trying to remove all whitespace around page and then check if image is bigger than target resolution. If it is - downscale kick in. It it is not and upscale/stretch is disabled then KCC will center image on screen.
Every page is considered separately.
Your chapter 3 is converted correctly. Images are much smaller than Voyage resolution - so they are displayed in original size. Enabling upscaling will increase size of images and remove most of margin at the expense of their quality. Stretch would remove margins completely but it will decrease quality even more due to breaking image ratio.
TL;DR
Enable upscaling when images are much smaller than Voyage resolution. Stretch will force usage of entire screen but it might decrease quality too much.
Last edited by AcidWeb; 01-30-2015 at 04:28 PM.
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