I compared the rendering effects on KPW1 and KPW2, and found that the current redering waveform seems not suitable for KPW2? KPW2 uses the Carta E-ink with REGAL waveform, which is not reflected in the current Koreader release.
In KPW1, the ghost is negligible and the blank space is white, which make the rendering effect great. However, in KPW2, the screen becomes blurred even after turning over 2 or 3 pages. There is significant character ghost from previous pages and the blank space is not white any more, in other words, not like it used to be as in KPW1.
I report an issue in GitHub(issue id: 550) with 2 figures which I hope could help to illustrate the different rendering effect of KPW1 and KPW2.
