Hi Jaume,
no real tutorial until yet, but .... i have picked up several tips :
- square format as 100x100 pix or 400x400 Max upon a white background
- create a first picture convert in grey scale 256 colours. No transparency.
- create a second picture with the same attributes, copy
- on the first picture : special paste/ assemble the paste on the right
and so on, for the other pictures. Maximum size for the total width 2000 pix
- save the result in png format
Oh i missed a tuto on the Cath's web site : (in french

)
http://graphofil.graficat.net/modules/s ... ?itemid=26
Enjoy and good work.
