I believe the command you're looking for is `convert` (man convert)

]# convert infile.jpg -resize 640x768 outfile.jpg

good luck,
Bart

It 
On Mon, 2003-02-10 at 15:55, George Gambill wrote:
> I Have two pictures (.jpg) which were taken at 1600 x 1200.  They want to
> print (by default) huge (as in greater than 8.5 x 11).  I want to print them
> smaller.  I would like to resize them to 800 x 600 or 640 x 768.  
> 
> I can print them on 8.5 x 11 (or smaller) via software that came with my
> Cannon S750, running under control of Redmond and Co.  I want to use Linux.
> I want to get away from the regular feedings required by those Redmond
> folks.
> 
> First and for most, what Linux programs are available to resize the jpg
> and/or convert to another format?  Resizing will allow me to email them back
> to the grand daughter so she can print them also.
> 
> Second, is there a  better format than jpg?
> 
> Third, is there a better way to print smaller with Linux.
> 
> Thnks, George
> ---------------------------------------------------
> PLUG-discuss mailing list - PLUG-discuss@lists.plug.phoenix.az.us
> To subscribe, unsubscribe, or to change  you mail settings:
> http://lists.PLUG.phoenix.az.us/mailman/listinfo/plug-discuss