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Re: Compositing math in SVG

From: Steve Schafer <steve@fenestra.com>
Date: Fri, 20 Jul 2012 13:23:11 -0400
To: Calculemus <calculemus1988@gmail.com>
Cc: www-svg@w3.org
Message-ID: <bs4j085epu76f2phqe15h8htf76qk972e8@4ax.com>
On Fri, 20 Jul 2012 07:40:09 +0200, you wrote:

>I think I have found a problem with Photoshop blend modes or
>the SVG spec.
>
>I implemented ColorBurn as specified here:
>
>http://www.w3.org/TR/SVGCompositing/
>
>Here is a test I made:
>
>http://postimage.org/image/v4iuo3iyt/
>
>And here is what I get in Photoshop, notice the extra
>red pointed by the arrow:
>
>http://postimage.org/image/6s7ox8joh/
>
>That red must be an error, there is no red there
>in any of the input images. Here are the two images
>I blend:
>
>http://postimage.org/image/iqji3qood/
>http://postimage.org/image/vk32ywdp1/
>
>In this case I think it is an issue in Photoshop,
>what do you think?

Yes, it looks like an uncaught numeric overflow in one of the
computations.

-Steve Schafer
Received on Friday, 20 July 2012 17:23:32 GMT

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