I went through the original images and checked the digital values of the shades.
Interestingly, the blacks on the Onyx are generally darker than on the Remarkable. However, the blackest black on the Onyx (end of the bat) is the same as the blackest black on the Remarkable (the A icon on the left toolbar). The Remarkable actuaaly renders blacks in the image lighter than it is capable.
However, where the Remarkable wins hands down is the whites. They are far brighter than the Onyx. I have previously noticed the "greyness" of the Onyx background. It explains the relatively poor contrast of the Onyx compared to non-Android e-readers. It's not a huge difference, but it is significant.
If the hardware is the same, than I suppose the fault is in the software, and quite possibly the dithering that has been mentioned here. Incidentally I have read that the Likebook has worse contrast than the Onyx.
In any case, I like Onyx hardware, but if such better contrast is being achieved on other Android e-readers, then I will definately look hard at alternate devices in the future. Contrast is king, for me. Add to that that Remarkable is respecting OS licensing and releasing sources so that the community can develop, and the Remarkable is looking superior to me on many too many fronts to ignore.
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