.. _raster.webp:

================================================================================
WEBP - WEBP
================================================================================

.. shortname:: WEBP

.. build_dependencies:: libwebp

GDAL can read and write WebP images through
the WebP library.

WebP is a new image format that provides lossy compression for
photographic images. A WebP file consists of VP8 image data, and a
container based on RIFF.

The driver rely on the Open Source WebP library (BSD licensed). The WebP
library (at least in its version 0.1) only offers compression and
decompression of whole images, so RAM might be a limitation when dealing
with big images (which are limited to 16383x16383 pixels).

The WEBP driver supports 3 bands (RGB) images. It also supports 4 bands (RGBA)

XMP metadata can be extracted from the file,
and will be stored as XML raw content in the xml:XMP metadata domain.

Driver capabilities
-------------------

.. supports_createcopy::

.. supports_virtualio::

Creation options
----------------

Various creation options exists, among them :

-  .. co:: QUALITY
      :choices: [1-100]
      :default: 75

      By default the quality flag is set to 75, but this
      option can be used to select other values. Values must be in the
      range 1-100. Low values result in higher compression ratios, but
      poorer image quality.

-  .. co:: LOSSLESS
      :choices: TRUE, FALSE
      :default: FALSE

      By default, lossy compression is used. If set to TRUE, lossless
      compression will be used.

-  .. co:: LOSSLESS_COPY
      :choices: AUTO, YES, NO
      :since: 3.7
      :default: AUTO

      Whether conversion should be lossless.
      In AUTO or YES mode, if LOSSLESS=YES and the source dataset uses WEBP
      compression, lossless copying of it is done.
      If set to NO, or in AUTO mode if the source dataset does not use WEBP
      compression, the regular conversion code path is taken, resulting in a
      lossless or lossy copy depending on the LOSSLESS setting.

See Also
--------

-  `WebP home page <https://developers.google.com/speed/webp/>`__
