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how to improve Eink display

Question asked by 张 松源 on Sep 19, 2018
Latest reply on Oct 10, 2018 by 张 松源

As we can see in the picture, picture 2 is better than picture 1, how do I enhancement of contrast to make picture 1 as well as picture 2.  such as modify the GPU register or so on.  thank you !!