I am unfortunately very stupid and after several hours struggle have not made any progress, so I'm hoping someone can help me out. I'm not an artist but need to do some basic image editing-type things for a project. I would like to:
be able to draw a line on an image and then resize the entire image such that the line is 6 inches long (or whatever)
convert a simple black-and-white png to vector form
Are there programs that would be able to do either of these things? I expect to do a lot of googling of tutorials but I don't even know where to start. Any help is deeply appreciated - I think I actually understand less than I did when I started trying to learn this morning.