- From: Myles C. Maxfield via GitHub <sysbot+gh@w3.org>
- Date: Tue, 14 Nov 2017 22:01:54 +0000
- To: public-svg-issues@w3.org
litherum has just created a new issue for https://github.com/w3c/svgwg:
== 'color-interpolation' isn't used for alpha compositing ==
The [definition](https://www.w3.org/TR/SVG/painting.html#ColorInterpolationProperty) of `color-interpolation` states:
> The ‘color-interpolation’ property specifies the color space for ... alpha compositing.
However, it appears that no implementations actually do this.
Here is the test file. In an implementation which follows the spec wording, the apparent color of the circles should be different.
```svg
<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C/DTD SVG 1.1//EN" "http://www.w3.org/Graphics.SVG/1.1/DTD/svg11.dtd">
<svg version="1.1" xmlns="http://www.w3.org/2000/svg">
<rect x="0" y="0" width="100" height="100" fill="white" stroke="red"/>
<circle cx="50" cy="50" r="30" fill="black" opacity="0.5"/>
<g color-interpolation="sRGB">
<rect x="100" y="0" width="100" height="100" fill="white" stroke="red"/>
<circle cx="150" cy="50" r="30" fill="black" opacity="0.5"/>
</g>
<g color-interpolation="linearRGB">
<rect x="200" y="0" width="100" height="100" fill="white" stroke="red"/>
<circle cx="250" cy="50" r="30" fill="black" opacity="0.5"/>
</g>
</svg>
```
And here are screenshots of the implementations:
<img width="1280" alt="screen shot 2017-11-14 at 1 47 55 pm" src="https://user-images.githubusercontent.com/918903/32807182-e1ad0822-c943-11e7-8899-0315bf076623.png">
Please view or discuss this issue at https://github.com/w3c/svgwg/issues/366 using your GitHub account
Received on Tuesday, 14 November 2017 22:02:10 UTC