I see document says:
color: The color of the slot for the setup pose. This is an 8 character string containing 4 two digit hex numbers in RGBA order. Assume “FFFFFFFF” if omitted.
But I think the order in skeleton example json is argb, not rgba. Am I right?
Nope, it's RGBA. 🙂 The template image is tinted a reddish see-thru color.