Adobe Illustrator’s Live Trace feature is a phenomenal way to transform a raster image into a vector image—or to put it more plainly—to turn a photograph into a drawing. Placing a raster ...

In order to turn your new halftone artwork into a vector object, you’ll need to use Illustrator’s Live Trace. Select the halftone artwork with the Object Selection Tool and choose Object ...

Once you've loaded the file, you can use the "Image Trace" button to convert the image into a vector graphic. You can choose various options, including the number of colors to include in the image ...

However, the traced version will not look stretched when it is enlarged because it has been changed to vector. Remember the tracing result will look different based on the original image.