public ImageInterface::convert($extension)
Instructs the toolkit to save the image in the format specified by the extension.
string $extension: The extension to convert to (for instance, 'jpeg' or 'png'). Allowed values depend on the current image toolkit.
bool TRUE on success, FALSE on failure.
\Drupal\Core\ImageToolkit\ImageToolkitInterface::getSupportedExtensions()
public function convert($extension);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Image!ImageInterface.php/function/ImageInterface::convert/8.1.x