Invert black and white SVG files

[Sverrir (Sverrir Tryggvason)]

Hi, I didn’t find a topic about it so I just decided to make a new one…
I’m marking a few tumblers and I have a lot of nice SVG files (black and white) but the problem is that I want to invert the SVG files so it burns right onto the tumblers. Is there a good solution for this? The only way I know is to (in LightBurn) convert to Bitmap and then I can invert it. But I’m not as happy with the result.
If someone know a good way to do this and want to share it it would be awesome Or LightBurn could add these features to LightBurn

[berainlb (PY)]

I’ll assume the contents of the SVG are vector graphics. In that case, vectors shapes in LightBurn become inverted when shapes overlap. More specifically, an odd number of stacked shapes will result in a positive area whereas an even number of stacked shapes will result in an inverted area.

So if you want to invert the entire design then either add a background shape to everything or remove an existing background shape if one exists.

If you want more specific guidance then upload a screenshot or the SVG file itself for review with comments to understand what specifically you’re trying to achieve.

[Sverrir (Sverrir Tryggvason)]

Here is one of the SVG I’m trying invert…

[Sverrir (Sverrir Tryggvason)]

If I mark this on a black tumbler it actually only marks the black part of the graphics, but comes out nice if I invert the graphics.

[parsec (FerAS)]

Sorry to step in.
Like this?

.
Or all inverted?

[Sverrir (Sverrir Tryggvason)]

Like that.
If I change it to jpg and invert it then I get an black square around the graphics that I don’t want…

[Sverrir (Sverrir Tryggvason)]

How did you do that?
That is exactly what I been trying to do

[parsec (FerAS)]

Like @berainlb wrote if you add a shape to everything…
Select all shapes (.SVG) and offset(1mm or less) and get what you’re after.

[Sverrir (Sverrir Tryggvason)]

Thank you that offset tool is amazing!
I have to study it better, how did you manage to have it like the first one? with the N,S;W,E black?

[parsec (FerAS)]

First ungroup the shapes then with CTRL pressed click each text to unselect and apply offset.

[Sverrir (Sverrir Tryggvason)]

Thank you so much!!

[berainlb (PY)]

@berainlb

More specifically, an odd number of stacked shapes will result in a positive area whereas an even number of stacked shapes will result in an inverted area.

I suggest you read this multiple times and play with some examples until this concept becomes second nature as this is one of the core principles driving vector graphics. Nothing makes sense until this is clearly understood.

[parsec (FerAS)]

Just to complete the information.

LightBurn Editor FAQ - LightBurn Documentation

How do I invert (negate) a vector engraving?

If you want to invert a vector engraving (Fill layer) you need to add an outline to it. Think about what happens when you scan a circle, compared to the letter ‘O’. The inner ring of the O toggles the fill. If you add another shape (like a square) outside it, it negates the whole thing: [image] And a slightly different example, this time done by changing the outer line around the design to a ‘Line’, instead of leaving it as part of the Fill layer: [image] In the case above, the design alr…