how to edit menü-png's ?

[konga]

hello,

i tried to change the sl91 icons from blue to orange.
on pc it looks perfect, but on my el71 it look's like an 8bit png.
whats wrong? which programm i should use?

-konga

[mart22]

does it like there is a black line at the edge of the icon? Which icons are you editing?

[konga]

i've edit the sl91 icons.