Originally Posted by ProDigit
I think the problem is that we don't know what the best size is.
548x754 will be the best format for text margins in pdf.
jpg's need to use the full screen.
Making them smaller than the viewable area will result in loss of quality.
Making them larger results in loss of battery life, and display time.
Some pages I could format perfectly in 320x240 and they still will be viewable, but the quality of the page will suffer...
That is why I suggested the second option of converting into LRF. First, you can make the images with arbitrarily large resolution and then use PDFLRF or Comic2lrf. Then we don't need to worry about the correct resolution at all.
Of course, if you would like to read PDF using 1000's of splitted jpg/png/gifs, then you have to figure out the correct resolution. However, since LRF is much faster and easier to manage, I cannot think of any good reason to use image files instead of LRF.