My lines are always curved
Why do the lines I get always bend? Whether I use vectorization or any other settings, the lines are never perfect. I saved them in PNG and JPEG formats, but the problem persists.

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Because you're vectorising a pixelated raster image. Just use SVG, which is significantly more efficient and 100% accurate.
Depends on quality: 300dpi is enough for raster image. Svg depends on the vector software, original photo (if low dpi a svg would turn like that)