Originally Posted by pirl8
Maybe it's an "involution"? Half the memory, no audio support, no "home" button, 16 instead of 256 levels of grey...
Any clue if the new 5.2.0 firmware already comes with multilanguage support?
No eink screens are 256 colors. The K4 and K5 have two copies of the 4-bit value in each byte of the framebuffer. You can verify that by copying a screensaver image to your host PC and run a histogram on it, which will show 16 evenly-spaced spikes (4bpp). And the GPL source code for the eink driver says the top and bottom half of the bytes must match to prevent unpredictable hardware-dependent visual anomalies. Look at my newtrix demo to see how to display 256 colors by dithering it down to 16 colors. There is hardware dithering support in the K4/K5 SoC, but the Kindles don't use it (yet), as it looked when I studied it back in December.