Shrinking the size of images in gimp

[Stewart C. Russell]

Howard Gibson wrote:
> 
>    How about...
> 
> convert -quality 50 file.jpg smallerfile.jpg

The result may appear horrible, especially in MSIE. It has very nasty 
JPEG rendering code which makes anything under about 80% look vile.

I wasn't ever quite sure what the OP meant by 'shrinking the size of'. 
Was it:

* reducing the pixel count? (if so, gimp-2's cubic rescale is the nicest 
way I've seen of doing it)

* reducing the colour depth?

* recompressing the image somehow? (using a more compressed lossless 
format, like exchanging PPM for PNG, or using a lossy format like JPEG, 
JPEG2000, JBIG (for B&W images), or DjVu).

  Stewart
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