Hi,

can any one help me i want to emit particles from texture (RAMP).
similarly like maya particles.

thanks in advance

there are more than one way. one way is to control the emission by primitive attrribute, but chances are good You will see the geometry resolution when emitting many points. another way is to emit many more points and filter the ones that are not needed at the first frame.
I attached a little example with both.

You could also combine both together

you can use pic function to access texture from cop network
pic(copname, U, V, color_type)
or to access texture tex(filename, U, V, color_type)
check-out a video tutorial on sidefx site
http://www.sidefx.com/index.php?option=com_content&task=view&id=1423&Itemid=345 [sidefx.com]