/** @format */
/**
 * Class representing the physical pixel dimensions of a PNG image.
 */
export declare class PngPhysicalPixelDimensions {
    /**
     * Conversion factor from meters to inches.
     */
    private static readonly _inchesPerM;
    /**
     * Unit specifier for unknown units.
     */
    static readonly unitUnknown: number;
    /**
     * Unit specifier for meters.
     */
    static readonly unitMeter: number;
    /**
     * Pixels per unit on the X axis.
     */
    private _xPxPerUnit;
    /**
     * Gets the pixels per unit on the X axis.
     * @returns {number} Pixels per unit on the X axis.
     */
    get xPxPerUnit(): number;
    /**
     * Pixels per unit on the Y axis.
     */
    private _yPxPerUnit;
    /**
     * Gets the pixels per unit on the Y axis.
     */
    get yPxPerUnit(): number;
    /**
     * Unit specifier, either `unitUnknown` or `unitMeter`.
     */
    private _unitSpecifier;
    /**
     * Gets the unit specifier.
     */
    get unitSpecifier(): number;
    /**
     * Constructs a dimension descriptor with the given values.
     * @param {number} xPxPerUnit - Pixels per unit on the X axis.
     * @param {number} yPxPerUnit - Pixels per unit on the Y axis.
     * @param {number} unitSpecifier - Unit specifier, either `unitUnknown` or `unitMeter`.
     */
    constructor(xPxPerUnit: number, yPxPerUnit: number, unitSpecifier: number);
    /**
     * Constructs a dimension descriptor specifying x and y resolution in dots per inch (DPI).
     * If `dpiY` is unspecified, `dpiX` is used for both x and y axes.
     * @param {number} dpiX - Dots per inch on the X axis.
     * @param {number} [dpiY] - Dots per inch on the Y axis.
     * @returns {PngPhysicalPixelDimensions} A new instance of `PngPhysicalPixelDimensions`.
     */
    static fromDPI(dpiX: number, dpiY?: number): PngPhysicalPixelDimensions;
    /**
     * Checks if this instance is equal to another `PngPhysicalPixelDimensions` instance.
     * @param {PngPhysicalPixelDimensions} other - The other instance to compare with.
     * @returns {boolean} `true` if the instances are equal, `false` otherwise.
     */
    equals(other: PngPhysicalPixelDimensions): boolean;
}