Horst Krug

Hello everyone,

When I turn the screen on my iPad 1 Amazon Kindle App.

from white to a black background - with white letters (instead of black
letters)

- normally should it be, that I save energy on that

Could that be right ?

Regards from Munich Germany

-Horst Krug-

Wes Groleau

On 11-05-2011 07:03, Horst Krug wrote:
> When I turn the screen on my iPad 1 Amazon Kindle App.
> from white to a black background - with white letters (instead of black
> letters)
> - normally should it be, that I save energy on that

You save energy per unit of time. But the difference is tiny.

You also make your eyes work harder to focus on it, because
the pupils widen due to the overall lower brightness.

If that makes you read slower (I don't know whether it does or not)
then you might actually be using _+more_ battery power.

--
Wes Groleau

First Language Acquisition observed up—close & personal
http://Ideas.Lang-Learn.us/barrett?itemid=1349

Horst Krug

No – i found out, that it is better to read an eBook – with black
background, and lightened letters.



In this case I became the question – that I must save energy in this
mode, because it need less energy for black background instead of
white.



I read other sources that it is for the eyes better, when the
background is black – and not so light.



Regards from Munich /Germany

Wes Groleau

On 11-05-2011 15:40, Horst Krug wrote:
> I read other sources that it is for the eyes better, when the background
> is black – and not so light.

That might be true.

But empirical studies have shown better readability
with dark on light.

So, like so many things, have to weigh the good and the bad and choose..

--
Wes Groleau

First Language Acquisition observed up—close & personal
http://Ideas.Lang-Learn.us/barrett?itemid=1349

Todd Allcock

At 05 Nov 2011 20:40:29 +0100 Horst Krug wrote:

> No – i found out, that it is better to read an eBook – with black
> background, and lightened letters.
>
>
>
> In this case I became the question – that I must save energy in this
> mode, because it need less energy for black background instead of white.


That's true of AMOLED screens, but AFAIK, it doesn't matter with LED,
where the majority of the power is consumed by the backlighting.



> I read other sources that it is for the eyes better, when the
> background is black – and not so light.



Perhaps, but my preference is black text on a light (but not white)
background, like light gray or a pastel color.