SVG — the SVG format — is essentially distinct from JPG. Whereas JPG saves images as a grid of pixels, SVG encodes illustrations as mathematical definitions of geometric shapes. Which means SVG graphics can be displayed at any size — from a 16x16 pixel favicon to a massive print — with no loss of sharpness.
Converting JPG to SVG is a technique known as image vectorization, and it is particularly valuable for illustrations and clean graphics.
Prior to converting JPG to SVG, it is important to realize how the process works. A JPG is a bitmap image — a static grid more info of pixels. SVG files are a mathematical image — a set of mathematical instructions that applications renders as the artwork.
The conversion works great for simple images with distinct shapes and few colors — icons, logos, symbols and line art. It works less well for complex photos with complex gradients.
For quality conversion, Adobe Illustrator's Image Trace tool provides the most flexibility. Open your JPG in Illustrator, click the graphic, open the Image Trace dialog and choose an relevant setting.
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