SVG vs PNG for Laser Engraving
For laser cutting and vector engraving: use SVG. For photo engraving (dithering and grayscale burn): use PNG at 300+ DPI. Each format serves a different laser operation type.
When to Use SVG for Laser
SVG is the preferred format for vector-based laser operations.
- Vector cutting: SVG paths define precise cut lines — no resolution limit
- Text engraving: SVG text converted to paths engraves with sharp edges
- Score lines: SVG stroke paths create clean scoring lines
- Geometric designs: SVG shapes engrave with mathematically perfect precision
- Logo engraving: SVG logo outlines engrave cleaner than raster PNG at small sizes
When to Use PNG for Laser
PNG raster format is better for photo-style laser engraving.
- Portrait engraving: grayscale PNG with dithering produces realistic burned portraits
- Photograph to wood: PNG processed with dithering algorithm in Lightburn
- Texture engrave: complex texture fills are easier as PNG than SVG
- Halftone art: PNG halftone patterns engrave with photographic depth
- For Glowforge photo engrave: PNG processed as grayscale or dithered bitmap
Frequently Asked Questions
Can I engrave a PNG photo on wood with a laser?
Yes — process the PNG in Lightburn or Glowforge software as a raster engrave operation. Use grayscale mode or a dithering algorithm. The laser power varies by pixel brightness, producing a photo-realistic engraving. 300+ DPI PNG gives best detail.
Does Glowforge use SVG or PNG for engraving?
Glowforge uses both. SVG filled shapes: vector engrave (very crisp, fast). PNG/JPG photos: raster engrave (photographic quality, slower). You can combine both in the same Glowforge job file — some elements as SVG, photos as PNG.
What DPI should I use for PNG laser engraving?
Match your laser's DPI resolution. Diode lasers: 254 DPI or 508 DPI. CO2 lasers: 300–600 DPI. Fiber lasers: 300–1200 DPI. The PNG resolution should match or exceed the laser's engraving DPI for maximum detail.
Why does my PNG engrave look pixelated on wood?
The PNG resolution is too low for your laser's DPI. Upscaling a low-res PNG doesn't add real detail. Start with a higher-resolution source image. For portrait engraving: minimum 800x800px source; 2000x2000px or higher for best results.
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