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Editorial Team
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Asked: 2026-06-08T03:45:14+00:00

I’m generating a svg image from a bmp image with potrace . The generated

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I’m generating a svg image from a bmp image with potrace. The generated image shows fine in Illustrator, but when I try to show it with SVGKit on an iPad it loads a blank image.

SVGKit works with svg-images I’ve created with Illustrator.

To simplify things I have created a bmp image with a simple black line.

This is what Illustrator generates (SVGKit does show this correct):

<?xml version="1.0" encoding="utf-8"?>
<!-- Generator: Adobe Illustrator 15.1.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<svg version="1.0" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
 width="1024px" height="768px" viewBox="0 0 1024 768" enable-background="new 0 0 1024 768" xml:space="preserve">
    <g>
        <g>
            <path fill-rule="evenodd" clip-rule="evenodd" fill="#FFFFFF" d="M1,0c341,0,682.001,0,1023,0c0,255.995,0,512.006,0,768
        c-341.333,0-682.667,0-1024,0C0,513,0,258,0,3C-0.086,1.581-0.165,0.168,1,0z M160,391c0,5.667,0,11.333,0,17
        c204.999,0,410,0,615,0c0-6.667,0-13.333,0-20c-204.661,0-409.337,0-614,0C159.835,388.168,159.914,389.581,160,391z"/>
            <path fill-rule="evenodd" clip-rule="evenodd" d="M161,388c204.663,0,409.339,0,614,0c0,6.667,0,13.333,0,20
        c-205,0-410.001,0-615,0c0-5.667,0-11.333,0-17C159.914,389.581,159.835,388.168,161,388z"/>
        </g>
    </g>
</svg>

This is what potrace generates (SVGKit does not show this correct, but Illustrator does):

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 20010904//EN" "http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">
<svg version="1.0" xmlns="http://www.w3.org/2000/svg" width="1024.000000pt" height="768.000000pt" viewBox="0 0 1024.000000 768.000000" preserveAspectRatio="xMidYMid meet">
    <metadata>
    Created by -protrace define- -version define-, written by Peter Selinger 2001-2011
    </metadata>
    <g transform="translate(0.000000,768.000000) scale(0.100000,-0.100000)" fill="#000000" stroke="none">
        <path d="M1600 3700 l0 -100 3075 0 3075 0 0 100 0 100 -3075 0 -3075 0 0 -100z"/>
    </g>
</svg>

So as far as I can see there is some differences in the headers, but even if I use the exact same header from Illustrator’s result in potrace’s result, SVGKit still can’t show it.

What is wrong/different with potrace’s result since SVGKit can’t show it?

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1 Answer

  1. Editorial Team

    It’s the transforms. The core build of SVGKit doesn’t support transforms.

    My experimental branch (which will eventually be merged into core) has good support for transforms – it includes Matrix, Translate … I’m not sure about Scale (it would only take a few minutes to add if it’s missing – if you do a search for “matrix” I think you’ll find the code quickly.

    NB: this branch changes the syntax for loading an SVG. It’s a lot simpler, but you have to call a different class (SVGKImage). Full instructions on the README at bottom of page:

    https://github.com/adamgit/SVGKit/tree/transforms

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