Extending Whilst Preserving Gif Transperancy

[STT]

G'day,
I have a folder of ~100 animated .gif images with various transparency colours that I wish to enlarge into 40x40 images with the existing image centred.

Using "convert <image> -gravity center -extend 40x40 <newImage>" works but imposes a white background.
"convert <image> -gravity center -extend 40x40 -background none <newImage>" and
"convert <image> -gravity center -extend 40x40 -background transparent <newImage>" also imposes the background.
How do I do the extension without creating a white background?

Cheers,
STT

[snibgo]

Perhaps "-resize" will do what you want.

[fmw42]

put the -background color BEFORE the -extent

[STT]

Perhaps "-resize" will do what you want.

Nah, that would have distorted the images. :P

put the -background color BEFORE the -extent

Cheers, that did exactly what I wanted.