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diff --git a/docs/advanced/image-processing.rst b/docs/advanced/image-processing.rst new file mode 100644 index 0000000..dba71d0 --- /dev/null +++ b/docs/advanced/image-processing.rst @@ -0,0 +1,19 @@ +Image processing +================ + +Images are processed by the `Python Imaging Library (Pillow) +<https://pillow.readthedocs.io/en/stable/index.html>`_ which supports a `wide +variety +<https://pillow.readthedocs.io/en/stable/handbook/image-file-formats.html>`_ of +image formats. Processed images are stored in the :ref:`overview-object-store` +using the `webp <https://developers.google.com/speed/webp>`_ format. Images are +resampled using a `Lanczos filter +<https://pillow.readthedocs.io/en/stable/handbook/concepts.html#PIL.Image.Resampling.LANCZOS>`_. + +Scaling +------- + +By default, images are scaled to fit within the bounds of ``4200x2000`` pixels +for display in the reader, and ``1680x800`` pixels for use as thumbnails. These +values are optimized for larger displays and may be :ref:`changed in the +configuration file <cfg-scale>` if you do not require such high resolutions. |