Quote:
Originally Posted by Rev. Bob
In your edit, you completely missed that I said the same thing - just in more general terms - in the message right above yours.
My later point remains true, though. Even a "full" 256-gray image will be a much smaller file than a true-color image of the same dimensions, so sending a gray version would raise the number of books one can store on that device by a considerable factor... probably a more significant margin than the existing resize option permits. (True color is typically encoded as either three or four 256-level channels; grayscale only uses one.)
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What I do with the cover is use Calibre's editor to reduce the size to 1500 lines if it's larger and I losslessly compress at 80%. That works and reduces the cover image size enough. I prefer to keep the color images. I know grayscale images are going to be smaller, but I don't try to cram my H2O full of books.