SVG — vector graphics — is essentially separate from JPG. While JPG saves images as a pixel grid, SVG encodes illustrations as mathematical definitions of paths and colors. Which means SVG images can be displayed at all sizes — from a 16x16 pixel favicon to a large banner — with no quality loss.
Changing JPG to SVG is a operation known as image vectorization, and it is especially useful for icons and clean graphics.
When converting JPG to SVG, it is necessary to know what happens. JPG files are a pixel-based image — a fixed grid of pixels. An SVG is a vector image — a collection of paths which software renders as the graphic.
The conversion works great for simple images with distinct shapes and few colors — logos, icons, silhouettes and illustrations. It does not work for complex photos with complex gradients.
For best output, Illustrator's Image Trace feature offers the most precision. Open your JPG in Illustrator, select the graphic, open the Image Trace dialog and choose an relevant setting.
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