Hi I was trying to help someone produce an equivalent of the "Overlay" blending mode in Photoshop using SVG filters. However, once I saw the formula for it, it became obvious that it isn't really possible to reproduce because of its piecewise nature. I also notice that "Overlay" is missing from the Compositing and Blending spec. I'm curious why it was excluded considering almost all the other ones are represented. But anyway, it made me wonder whether it would make sense to add a new filter type that would allow piecewise functions to be implemented. For example, "Overlay" could be implemented using a definition like the following: <filter id="overlay"> <fePiecewise in="SourceGraphic" channelSelector="A"> <fePiecewiseNode min="0" max="0.5"> <feComposite operator="arithmetic" k1="2" k2="0" k3="0" k4="0"/> </fePiecewiseNode> <fePiecewiseNode min="0.5" max="1"> <feComposite operator="arithmetic" k1="-2" k2="2" k3="2" k4="-1"/> </fePiecewiseNode> </fePiecewiseNode> </filter> Thoughts? PaulReceived on Tuesday, 25 March 2014 07:53:33 UTC
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