Alignment of the images ('start', 'center', or 'end'). Default is 'start'.
Background color. Can be a string (e.g., "#ffffff", "black", "transparent") or an object with r, g, b, and alpha properties. Default is {alpha: 1, b: 0, g: 0, r: 0}.
Direction of the merged image ('vertical' or 'horizontal').
Margin of the result image. Can be a number, a string (CSS shorthand), or an object with top, right, bottom, and left properties.
Offset in pixels between each image. Default is 0.
Options for merging multiple images.