Hi Yingwu,
I think this is related to the way the screen is updated when scribbling and when doing a full-screen update. They have to make a choice between quick and good. The quick leads to lighter 'black'.
I do not know if the scribbles/annotations get lighter if the DR gets older? Do you think that they are lighter then when you bought the DR?
I have not seen a way to increase the contrast in the published code. Showing the menu, normally leads to a full screen refresh, but having to do that often is very annoying :-(
If you see this with Xournal, I could add a 'refresh-button'.
Marcel.
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