TYPO3 v7 has reached its end-of-life November 30th, 2018 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.

Default configuration

TYPO3 CMS comes with some default settings, which are defined in file typo3/sysext/core/Configuration/DefaultConfiguration.php.

Here is an extract of that file:

return array(
        'GFX' => array(
                // Configuration of the image processing features in TYPO3. 'IM' and 'GD' are short for ImageMagick and GD library respectively.
                'image_processing' => true,                        // Boolean: Enables image processing features. Disabling this means NO image processing with either GD or IM!
                'thumbnails' => true,                            // Boolean: Enables the use of thumbnails in the backend interface.
                'thumbnails_png' => 0,                            // Bits. Bit0: If set, thumbnails from non-jpegs will be 'png', otherwise 'gif' (0=gif/1=png). Bit1: Even JPG's will be converted to png or gif (2=gif/3=png)
                'gif_compress' => true,                            // Boolean: Enables the use of the \TYPO3\CMS\Core\Utility\GeneralUtility::gifCompress() workaround function for compressing giffiles made with GD or IM, which probably use only RLE or no compression at all.

You will probably find it interesting to take a look at that file, which also contains values not displayed in the Install Tool and thus not easily available for modification.