ivate function update_image_resource( $image, string $extension ) {
		if ( ! function_exists( 'imageistruecolor' ) ) {
			throw new FunctionUnavailableException( 'imageistruecolor' );
		}

		if ( ! imageistruecolor( $image ) ) {
			if ( ! function_exists( 'imagepalettetotruecolor' ) ) {
				throw new FunctionUnavailableException( 'imagepalettetotruecolor' );
			}
			imagepalettetotruecolor( $image );
		}

		switch ( $extension ) {
			case 'png':
				if ( ! function_exists( 'imagealphablending' ) ) {
					throw new FunctionUnavailableException( 'imagealphablending' );
				}
				imagealphablending( $image, false );

				if ( ! function_exists( 'imagesavealpha' ) ) {
					throw new FunctionUnavailableException( 'imagesavealpha' );
				}
				imagesavealpha( $image, true );
				break;
		}

		return $image;
	}

	/**
	 * {@inheritdoc}
	 *
	 * @throws ConversionErrorException
	 * @throws FunctionUnavailableException
	 * @throws ResolutionOversizeException
	 */
	public function convert_image_to_output( $image, string $source_path, string $output_path, string $format, array $plugin_settings ) {
		$function = self::get_format_function( $format );
		if ( $function === null ) {
			return;
		}

		$image          = apply_filters( 'webpc_gd_before_saving', $image, $source_path );
		$output_quality = min( $plugin_settings[ ImagesQualityOption::OPTION_NAME ], self::MAX_METHOD_QUALITY );

		if ( ! function_exists( $function ) ) {
			throw new FunctionUnavailableException( $function );
		} elseif ( ( imagesx( $image ) > 8192 ) || ( imagesy( $image ) > 8192 ) ) {
			throw new ResolutionOversizeException( $source_path );
		} elseif ( is_callable( $function ) && ! $function( $image, $output_path, $output_quality ) ) {
			throw new ConversionErrorException( $source_path );
		}

		if ( filesize( $output_path ) % 2 === 1 ) {
			file_put_contents( $output_path, "\0", FILE_APPEND );
		}
	}

	/**
	 * @param string $source_path .
	 *
	 * @link https://www.php.net/manual/en/function.imagecreatefromgif.php#104473
	 */
	private function is_animated( string $source_path ): bool {
		if ( ! ( $fh = @fopen( $source_path, 'rb' ) ) ) { // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
			return false;
		}

		$count = 0;
		while ( ! feof( $fh ) && ( $count < 2 ) ) {
			$chunk = fread( $fh, 1024 * 100 );
			$count = $count + preg_match_all( '#\x00\x21\xF9\x04.{4}\x00(\x2C|\x21)#s', $chunk ?: '', $matches );
		}

		fclose( $fh );
		return ( $count > 1 );
	}
}