ubuntu-users Digest, Vol 101, Issue 90

[Roger]

On 01/25/2013 09:22 AM, ubuntu-users-request at lists.ubuntu.com wrote:
> >>>>>the programm I am using is gimp is there any other program for the
> >>>>>same?
> >>>>>If this is possible in gimp then how to do so?
> >>>>>-------------------------
In Gimp.
Menu <Image> <Scale Image>
Set x and y resolution to 72  ppi and scale the dimensions to Width 250 
px  by what ever height it automatically comes out at.
Save or export(Gimp 2.8) image as imagenameV2s.jpg - where V means Version.

If that is too big - scale the primary image Width to 150px and save as 
imagename V3s.jpg
Now you have a relationship between size and dimensions so you can guess 
how much ore or less to scale to get the right kb value.

I routinely scale images to between 100 and 150 ppi  this way. But you 
cannot scale up again because it loses pixels so that's why you keep the 
original and first 2 attempts. Delete the 2 attempts if you are certain 
you no longer need them.
Roger