pics0.png - not picso.png

[XeroMaster]

I have seen pics0.png...
what does this do? all it is, is a temlate with a soild color in replace of the tiles, in the same folder there is a onther pic that has a decoder. such as (color) = non-blocking;
I think it alows you to use tiles_inside.png, for 2002 pics

is there away to ake one for picso.png and walk on those tiles?

thanks.