easiest is to stick with email, keep your responses precise and specific and make sure the entire thread is maintained… so:
Q: please send image
A: sure what format?
Q: jpeg
A: here ya go
Q: that image has a white background, I need transparent
A: jpeg does not support transparency – do you want a png?
Q: yes please.
A: here ya go
Q: thanks – this other guy I’m working with is a complete moron
Insisting on email and keeping yr responses as short as possible are key.
Peter
shootingbynumbers.com