Image padding not working consistently

[cfloisand]

Padding an image does not work correctly if specifying a subset of options from left, right, top, bottom.

e.g.
image.pad({left: 20, top: 20, color: "#F00"});
results in:

image.pad({top: 20, color: "#F00"});
results in:

image.pad({right: 20, bottom: 20, color: "#F00"});
results in: