threshold not working like it used to in previous versions

[markl21810161]

hi guys, I'm trying to  use the threshold slider to clean up some black and white lineart I drew/inked. it's going to become a screen print so I can't have rough pixelated edges. why is this so difficult now in this new version?
am I missing something?

[John T Smith]

Please post the name of the Adobe program you use so a Moderator may move this message to that forum