What does Grey Level(Scale) mean

droople · 03-09-2010, 03:19 AM

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

pauli · 03-09-2010, 03:29 AM

it just says 16 levels of grey, not 16 bit. 16 levels of grey are enough to display pictures if properly dithered.

wallcraft · 03-09-2010, 06:34 AM

For a good example of what can happen with gray scales, see More display issues on the DR. It sounds like the Nook might not be doing any dithering, which is marginally acceptable with 16 gray levels.

applechutney · 03-10-2010, 03:52 AM

Quote:

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.

droople · 03-12-2010, 06:15 PM

Thank you guys~~

andrys · 03-12-2010, 08:32 PM

I did a blog article on this when the Kindle first went to the 16 levels of gray and what that meant vs 4 and 8 levels as far as potential.

It's at http://bit.ly/4vs16grays

03-09-2010, 03:19 AM	#1
droople Connoisseur Posts: 95 Karma: 388 Join Date: Jan 2010 Device: Nook,Nook Simple Touch, Nook Color	What does Grey Level(Scale) mean 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

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03-09-2010, 03:29 AM	#2
pauli Groupie Posts: 185 Karma: 119824 Join Date: Feb 2008 Device: iLiad, DR1000S, HTC Hero, DR800SG	it just says 16 levels of grey, not 16 bit. 16 levels of grey are enough to display pictures if properly dithered.

03-09-2010, 06:34 AM	#3
wallcraft reader Posts: 6,977 Karma: 5183568 Join Date: Mar 2006 Location: Mississippi, USA Device: Kindle 3, Kobo Glo HD	For a good example of what can happen with gray scales, see More display issues on the DR. It sounds like the Nook might not be doing any dithering, which is marginally acceptable with 16 gray levels.

03-12-2010, 06:15 PM	#5
droople Connoisseur Posts: 95 Karma: 388 Join Date: Jan 2010 Device: Nook,Nook Simple Touch, Nook Color	Thank you guys~~

03-12-2010, 08:32 PM	#6
andrys Explorer Posts: 218 Karma: 48926 Join Date: Feb 2009 Location: Berkeley, Califorina Device: Kindles,SurfacePro2,NookColor,Pocket Edge,Samsung 10.1 Tab,S2 phone	I did a blog article on this when the Kindle first went to the 16 levels of gray and what that meant vs 4 and 8 levels as far as potential. It's at http://bit.ly/4vs16grays

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