Most "professional" editing software will have filters that can do such things as what you're looking for. There are even "plug-ins" made for programs like Corel draw and Photoshop. Like in my sig below (yes, I know that Corey Dillon is no longer with the Pats, but I haven't had the time to take him out! GO PATS!), I used an ink outline to get that outlined effect (using Photoshop). What I think you are talking about was the difference between vector
image. Most images, vector or raster will look fine when reduced. When you enlarge them, that's when they start to look grainy or "pixelated". Different programs will have different features, unfortunately, I'm not familiar enough with them to know which ones could help you and wich ones would be useless to you. HERE
is a link to free programs that are in another section of this forum. Scroll down a bit to Graphics Design & Editing and below it you'll see the different programs.
Perhaps someone else will chime in that has a knowledge of some of the programs listed that can help to narrow things down for you!
War produces veterans, wounded both physically and mentally. They have sacrificed for us.....and it is now our job to help these veterans, as they have already helped us in ways we will never know, in ways that we cannot fathom, and in ways that we take granted every day.