I want to add a picture to this thread with a display comparison of three large format E-Readers: The iRex DR1000, Kindle DX and the Jetbook Color.
The first generation E-Ink screen of the iRex DR1000 has definitely a much weaker contrast in comparison to the DX or the JBC. The black on the JBC is very dark, but also the screen is more grey than the DR1000 or the DX.
I find reading on the JBC easier than on the DR1000, DX b/w pearl screen ist best, but it lacks color. So the "grey" background is the price you have to pay for the color ability.
The rest is said already, I think, JBC firmware must be improved, PDF-scaling and cropping should be included like in the iRex devices from the beginning.
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