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Image filters

Panels offers a way to tweak images in the reader for better reading experience. We like to differentiate between 3 groups: filters, transformations and shaders.

To access turn them on/off, simply tap "..." -> Image filters.


Filters only tweak images visually.

  • Reduce noise: works well for old scans with lots of color noise
  • Increase sharpness


Transformations change the geometry/size of pages.

  • Remove borders: tries to identify a vertical or horizontal border near the edge where all pixels are of a similar color.


Shaders are filters that take into account the image size, as well as the display size.

  • Reduce moire effect: apply this filter when patterns in drawings show moire effect.

You can apply multiple filters.