45 lines
1.8 KiB
Markdown
45 lines
1.8 KiB
Markdown
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# Contrast and Brightness in PDF (Black/White Effect)
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> PDF readability in **Librera Reader** can be improved significantly by manual adjustments to brightness and contrast settings. When you switch to manual mode, your document will be displayed in black-and-white and you will see the results of your adjustments in real time in the background, behind the **Contrast and Brightness** window.
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> The adjustments mimic the effect often used in E-Ink readers.
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You can adjust the following settings:
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* Contrast
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* Brightness
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* Or/and you can apply the automatic _Emphasize all_ setting (a bold-letter effect)
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> All three settings can be applied separately or you can use all three combined.
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## Contrast
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* Tap on the _Contrast/Brightness_ icon in the center-tap-menu
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* Check the _Adjust manually_ box in the **Contrast and Brightness** window and use the _Contrast_ slider (or **-** and **+**) to adjust the setting.
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* Tap outside the window (or on the _x_ in its upper right corner) to close it.
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## Brightness
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* Tap on the _Contrast/Brightness_ icon in the center-tap-menu
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* Check the _Adjust manually_ box in the **Contrast and Brightness** window and use the _Brightness_ slider (or **-** and **+**) to adjust the setting.
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* Tap outside the window (or on the _x_ in its upper right corner) to close it.
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## Emphasize all (bold-letter effect)
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* Tap on the _Contrast/Brightness_ icon in the "center-tap-menu"
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* Check the _Adjust manually_ box and then the _Emphasize all_ box
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* Tap outside the window (or on the _x_ in its upper right corner) to close it.
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> To discard your manual settings, use the _Restore default_ link at the bottom of the **Contrast and Brightness** window.
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