Re: Improving the quality of a blocky image

My result
http://i287.photobucket.com/albums/ll123/ememek/r23.png

It's done with Gimp. Final result given by dissolve of two images r2.png
and
r3.png (in above folder).

Exact procedure forgotten - all done empirically:(
As I remeber:

r3: steps:
- downsample to 512x64
- upsample to  1536x1536
- GREYCstoration filter
- Smart sharpen

r2 steps:
- custom convolution matrix (more smooth in vertical direction) used until
  blocks dissapear (I think it was about 10 convolutions)
- I'm not sure if a little "Smart sharpen" was in use.