A few questions:
1. What is the format of the files? PSD, AI, DXF, something else?
2. If each of these files was originally done in a vector program such as Illustrator, does one have access to the original file, or only a flattened, rendered, pixel-based version?
3. In the example you posted, did you make up the two line shapes yourself (and we are seeing the control points and paths/shapes that *you* used), or would one actually see these features if you opened up your files? Specifically, I'm trying to figure out whether each line was (tediously) drawn as a shape, as I suspect you did, or might the rounding be simply due to the size of the stroke and choice of line end options in AI.
T