"mike" wrote

I don't know the proper terms, but here's the idea.
Take a big pix at high resolution (eg spectators at a football game).
Use a combination of pixel scaling and compression to
get a highly compressed picture, small file size, picture 1.
Print picture 1.
Print the original picture.
Take scissors and cut out small parts of the high resolution
(eg a face)
pix and glue them on Picture 1 in the right places.

Wanna do that digitally.

Don't know if this is exactly what you mean, but XAT.COM Image Optimizer has
a 'magic compression' setting that only selects areas of unchanging colour
and density and hammers those while leaving the intricate areas alone. I use
it for compressing files to below a certain size for uploading to a website,
and it seems to work well. I think the older versions are now freeware, or
the current ones are available for trial.

Paul