Changing picbuf-data.

[Magnus Myrefors <myrefors magnus telia com>]

hi,

Does anyone know why you can't change the value of 
a pixbuf-pixel to yellow ? I have examined a pixbuf-dataarea
and it seems like a yellow color in the pixbuf is stored
like this [235, 3, 243, 1]. When I change a stored value
to these, one would expect that the result would be yellow
but when shown in a widget it becomes white instead.

magnus m