ponzo, comic2lrf sharpens the image slightly by default to improve legibility of the text in comics on the Reader, it also "normalises" the images. It uses 64 "colours" to encode the images, not 8, which is optimal for the PRS500, the PRS505 could go higher.
The 584x784 resolution is optimal for LRF as there is no scaling.
All the decisions were made from extensive testing I did when developing comic2lrf to produce the most optimal image quality on the PRS500 Reader.
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