Originally Posted by :D ominik
These pictures were taken with different aperture and exposure settings. Additionally they were taken with automatic white balance. These pictures don't tell anything about changed contrast/brightness/darkness, but a lot about the photographers skills.
The brightness is unchanged (it's impossible to change the brightness anyhow on eInk screens).
Seconding this. I think any perceived difference in the background's whiteness is down to the change in contrast achieved by rendering characters bolder; neither is the background whiter nor the black any blacker.
The change in contrast is IMHO due to the text being "overpainted" in some way: characters seem bolder and somewhat smudgier -- apparent with, e.g., the battery indicator, which looks much sharper in applications other than Reader. My impression is that more delicate fonts look less smooth now because of this.