- From: SVG Working Group Issue Tracker <sysbot+tracker@w3.org>
- Date: Tue, 05 Oct 2010 21:31:22 +0000
- To: public-svg-wg@w3.org
ISSUE-2380 (feColorRamp): Consider adding feColorRamp filter [Module: Filters] http://www.w3.org/Graphics/SVG/WG/track/issues/2380 Raised by: Doug Schepers On product: Module: Filters <http://lists.w3.org/Archives/Public/www-svg/2010Oct/0031.html>: [[ I'd like to propose adding an <feColorRamp> filter element to SVG. This is a simple filter that takes selects a channel from an input image and uses the intensity of a particular pixel to lookup a color value in a gradient. Reasons: At the moment, the SVG filtering system provides ways to perturb images in their domain (feDisplacementMap), but has only limited ability to remap their range (feColorMatrix is probably the best existing option). To use fractal noise and turbulence to produce natural effects such as fire, clouds, marble or wood, the intensity of the noise needs to be mapped to a color ramp (gradient). (See Ken Perlin's 'Making Noise' http://www.noisemachine.com/talk1/) Proposal: A new filter element should be added to svg called <feColorRamp>. It would have the following attributes: in: "SourceGraphic | SourceAlpha | BackgroundImage | BackgroundAlpha | FillPaint | StrokePaint | <filter-primitive-reference>" - Choose input image channelSelector: "R | G | B | A" - Determines channel of input image that is remapped ramp: <gradient> - The gradient that is used for remapping intensity values in the input channel Please let me know if you think this is a good idea, and where I should submit this proposal if this list is not the best place. ]]
Received on Tuesday, 5 October 2010 21:31:24 UTC