Fixed Layout eBook Conversion
We must fix the font size.
We must position the text on a background image (this usually is background art that lies behind the text in PDF). Test the appearance on a hardware device (Usually iPad, Nook or kindle).
We must fine-tune the appearance and position of text so that it matches the look and feel of its source file (PDF usually). This is a time-taking process.
Some books contain zig-zag text (or something similar to that). So, we must adjust word spacing, letter spacing and add line breaks at appropriate places to make the look and feel consistent with that of its source file. (Testing and fine-tuning is necessary again here, since appearances may vary in browser and on device. This adds to the complexity).