Trouble with export image

[Graham Samuel]

I seem to be going crazy, but I can't see what I'm doing wrong. I have an image say "myImage", and I export it with a command like

export img "myImage" of cd "myCard" of stack "myStack" to URL ("binfile:" & somePath &"/"&someFileName) as JPEG

This works, and the file appears, but it is not the right size: I mean if I do

put the rect of img "myImage"

immediately after the 'export', I get the rect I expected from the remainder of my code: but if I look at the actual file with say GraphicConverter on a Mac, then I find the image is cropped vertically.

I suppose I did something wrong, but I can't think what.

Any ideas?

TIA

Graham