Apples iPad lets you adjust your system-wide screen brightness, and also the screen brightness for specific applications like ebook readers.

To adjust the screen brightness for all applications, do this: Tap Settings.

Use the Brightness slider to increase or decrease your iPad displays overall maximum brightness.

Lowering the brightness level can help extend how long you can go before needing to recharge your iPad, too.

Since those controls are in-app, youd assume they control the brightness just for those applications and youd be partially right.

The brightness slider in the Kindle app adjusts the brightness just in-application, but the iBooks brightness slider controls how bright your screen is system-wide.

As if that isnt confusing enough, when you adjust screen brightness in iBooks, then hop back to Settings, the Brightness Wallpaper settings slider hasnt changed even though the screen brightness has.

I found, however, that after leaving iBooks if I tap the power button to lock my iPad, then tap it again, the system-wide brightness I set in Brightness Wallpaper has been restored.

Offering app-specific brightness controls gives iPad users more control over how they use their multimedia tablet, but does add some complexity since you need to keep track of your brightness settings in more than one location especially since Apples own in-app brightness controls work differently than the Kindle apps controls.

Knowing where those settings are, however, makes it easier to understand why your screen brightness might change when you switch applications.

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Control For Lowering Brightness Mac