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Originally Posted by DaleDe
I do not believe display resolution has anything to do with ligature use.
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Yes, they're simply a resolution of circumstances in which the characters would otherwise collide in an unsightly manner. The ugliness is a bit more apparent on high-res displays though.
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I do believe that the source eBooks should never use ligatures. Ligatures should be added by the rendering engine as one method among others to improve character tracking.
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The real problem lies in the extremely limited processor power available. Since readers need to conserve power, their processors are generally very poky and barely have enough grunt to lay out the page as it is. Witness how much faster the PRS600 turns pages compared to the 505 or 300 - that's nothing to do with the display, it's simply the result of a faster processor.
While everyone gets excited about new display tech (and yes, the 225dpi Mirasol display does look quite exciting, unlike all the others that I've heard of), there are a lot of improvements that will come simply by having more horsepower under the hood. I just hope that Adobe is working on a version of ADE with a full set of rendering improvements (smart typography, hyphenation to support smart justification with tracking adjustment, etc) that will make use of the increased power of the integrated single-chip solutions that are being developed.
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EBooks should be sources and not attempt to force rendering
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Well, an ePub is a final delivery container rather than a source document. If you want certain features right now, your only option is to hard-code them. What matters in an ePub is what the reader sees on the screen.