B/W jpeg - how do i thicken lines ?

 Hi all, first time poster, long time user of Corel for screenprinting art, but still lots to learn !

So, say i have a b/w line drawing as a jpeg scan, how do i in coreldraw, or corel photo paint (as i presume), whats the moves to easily thicken all the lines evenly ? I think in other programs this is called 'stroking'. Thanks if you can help ! Pete.