[applechutney]

Originally Posted by droople

Hi All

I'm just bought Nook, which on the wiki says it has 16bit grey levels.

https://wiki.mobileread.com/wiki/Nook

I put some image pdf into it, and found that the images have very obvious boards between the colours.

Which looks like this image:
http://en.wikipedia.org/wiki/File:Pa...me_palette.png

If the Grey level for ebook device is the same definition as the wiki
http://en.wikipedia.org/wiki/Grayscale

16bit should be enough for a picture, or 16 level means 4bit (16 levels of grey)?

Cheers

Hi,

It is actually 16 levels of Gray (4 bit).

Typically,
Text is displayed using 4 levels of gray.
Menu items & icons using 8 levels of gray.
Images are displayed using 16 levels of gray.

I have posted an image here...
(http://www.flickr.com/photos/8788289@N08/4422160802/)



best wishes
aPpLe ChUtNeY.