Attention

TYPO3 v8 has reached its end-of-life March 31st, 2020 and is not maintained by the community anymore. Looking for a stable version? Use the version switch on the top left.

There is no further ELTS support. It is recommended that you upgrade your project and use a supported version of TYPO3.

Install Tool

The Install Tool provides a convenient user interface for changing the global configuration. The "All Configuration" view lists all available options and makes them available for editing.

When changes are saved, the LocalConfiguration.php file is updated.

The "All Configuration" view of the Install Tool

Note how the configuration options description is taken from the values in the typo3/sysext/core/Configuration/DefaultConfigurationDescription.php file. Check out the code of the DefaultConfiguration and the matching description:

return [
   'GFX' => [ // Configuration of the image processing features in TYPO3. 'IM' and 'GD' are short for ImageMagick and GD library respectively.
      'thumbnails' => 'Boolean: Enables the use of thumbnails in the backend interface.',
      'thumbnails_png' => 'Boolean. If false, thumbnails from non-image files will be converted to \'gif\', otherwise \'png\' (default).',
      'gif_compress' => 'Boolean: Enables the use of the <code>\\TYPO3\\CMS\\Core\\Utility\\GeneralUtility::gifCompress()</code> workaround function for compressing giffiles made with GD or IM, which probably use only RLE or no compression at all.',
      'imagefile_ext' => 'Commalist of file extensions perceived as images by TYPO3. List should be set to \'gif,png,jpeg,jpg\' if IM is not available. Lowercase and no spaces between!',
      // ...
   ],
   // ...
];

return [
   'GFX' => [ // Configuration of the image processing features in TYPO3. 'IM' and 'GD' are short for ImageMagick and GD library respectively.
      'thumbnails' => true,
      'thumbnails_png' => true,
      'gif_compress' => true,
      'imagefile_ext' => 'gif,jpg,jpeg,tif,tiff,bmp,pcx,tga,png,pdf,ai,svg',
      // ...
   ],
   // ...
];