/** @format */
/**
 * Enum representing various PNM (Portable Any Map) formats.
 */
export declare enum PnmFormat {
    /**
     * Invalid format.
     */
    invalid = 0,
    /**
     * Portable Bitmap format.
     */
    pbm = 1,
    /**
     * Portable Graymap format (plain text).
     */
    pgm2 = 2,
    /**
     * Portable Graymap format (binary).
     */
    pgm5 = 3,
    /**
     * Portable Pixmap format (plain text).
     */
    ppm3 = 4,
    /**
     * Portable Pixmap format (binary).
     */
    ppm6 = 5
}