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Re: [css-compositing] group isolation and filters (corrected)

From: Nikos Andronikos <nikos.andronikos@cisra.canon.com.au>
Date: Wed, 8 Aug 2012 13:31:04 +1000
Message-ID: <5021DD78.6040605@cisra.canon.com.au>
To: <www-svg@w3.org>
On 8/08/2012 5:57 AM, Rik Cabanier wrote:

We had an offline discussion on the question if filters should cause their content to be isolated.
The current Filters spec does not require this [1]

Since this concept is hard to grasp I attached an example how this changes rendering.

The example at the top is a group that contains a blue and a green rectangle that is on top of a red rectangle.
In the second line, the green rectangle has a blend mode attached to it.
In the bottom line, there are 2 possible rendering for when the group has a filter effect applied to it.

My question is: what would you expect the result to be? A or B

I would expect B if the isolation property from the Compositing and Blending was accumulate - meaning the group is non-isolated.
The reason being, a non-isolated blend mode must blend with element outside of the group.

I would expect A if the isolation property from the Compositing and Blending was isolate.
In this case, the reason is that the blend mode is isolated and so the multiply is constrained within the group.
When the group is composited onto the scene, a normal blend mode will be used.


1: https://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#AccessBackgroundImage

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Received on Wednesday, 8 August 2012 03:31:35 UTC

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