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Originally Posted by anacreon
I just updated, and can't find the options. Also, I'm French, and have no idea what "dithering, letterboxing and PNGs" mean in this context. I'm particularly interested in removing the full sized cover images, which are no use to me since I use my own random images.
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The PNG option is to generate the cover images as PNGs rather than the JPGs that Kobo generates.
"Dithering", according to
Wikipedia is:
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Dither is an intentionally applied form of noise used to randomize quantization error, preventing large-scale patterns such as color banding in images.
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And "letterboxing" is adding black bands on the sides of the images to make them the same size as the screen but still retain the aspect ratio of the images. It should mean a better screensaver image as the firmware isn't reprocessing the image.
These are the same as the options in the driver. They have been translated there if that helps. The purpose is to improve quality of the image and/or reduce size. I don't know what the best combination is as I generally let the device generate the covers.