Filter Effects

2007-02-07T01:44:26Z

Mauve: Link to feature request in tracker

Filter effects is a part of [http://www.w3.org/TR/SVG11/filters.html SVG specification] and worked on in Inkscape as part of [[Googles_Summer_Of_Code]] 2006

== What works? ==

Basic support for filter effects is included in SVN trunk and in upcoming 0.45 release. At the moment only gaussian blur is implemented, so while specifications define a bunch of other effects and some other programs can handle them, Inkscape cannot render them yet. Also, tools for editing other types of filters do not exist yet.

Gaussian blur can be applied to an object by using Blur slider in Fill and stroke dialog.

In Inkscape preferences dialog there is a setting controlling the filter rendering quality. Even low quality often produces good enough rendering quality, but it takes a lot less time to render. When exporting an image from Inkscape, the best quality is always used, regardless of this setting.

== What next? ==

Now that this one filter works, most of the basic framework needed for filtering exists.

These are the basic steps to create a new filter primitive:
* Write a new document model level class for this filter primitive (see src/sp-gaussian-blur.cpp)
* Write a renderer for this filter primitive (see src/display/nr-filter-gaussian.cpp)
* Add a pointer to a function returning an instance of the renderer class to function Filter::_create_constructor_table in file src/display/nr-filter.cpp
(this is likely not an exhaustive list)

Before new filter primitives can be useful, there has to be an user interface for applying them to shapes. A really good thing would also be an UI for creating filters out of filter primitives.

: See [[http://sourceforge.net/tracker/index.php?func=detail&aid=1628343&group_id=93438&atid=604309 1628343]] for my filter UI suggestion - [[User:Mauve|Mauve]] 01:44, 7 February 2007 (UTC)

[[Category:Developer_Documentation]]

TutorialIdeas

2006-06-19T21:36:17Z

Mauve: Posted a link to a tutorial I just knocked up

This page will consist of brainstorming and basic development of new tutorials that will be useful for new/old users.

Also see [[TutorialsAndHelp]]

=== Completed Tutorials ===

* [[DefaultTutorial]]
* [http://home.programmer-art.org/?page=inkscape Daniel Taylor's Web-Based Inkscape Tutorials] - Hopefully he will make SVG tutorials that we can inlude with Inkscape, like our current [[DefaultTutorial]].
* making shiny marbles... http://inkscape.org/wiki_uploads/marbles_tut.svg
* also see [http://inkscape.org/cgi-bin/wiki.pl?OtherProjects#outsidetut Outside Tutorials and Tips]
* [[ElementsPrinciplesOfDesign]] (rejon)
* [http://kargs.net/docs/easter_egg_tutorial.svg Easter Egg Tutorial]

=== Tutorials in development ===

* [http://homepage.univie.ac.at/reinhard.stepanek/fxos80/metchart.html How to create meteorological charts with Inkscape], Tutorial by Reinhard Stepanek
* Daniel Pope's Clownfish Tutorial - [http://www.mauveweb.co.uk/misc/tutorials/clownfish.svg Part 1] [http://www.mauveweb.co.uk/misc/tutorials/clownfish2.svg Part 2] - drop me an email at mauve@mauveweb.co.uk to suggest changes.

=== Planned Tutorials ===

* [[UsingTheCloneTiler]] - Clones

* Text and Typography

* Clippath/Mask/Pattern

* Effects

* SVG Filters

* XML Editor

=== Tutorial Scratchpad ===

* How to create an icon
* How to build a presentation using Inkview.
* How to build complex shapes using boolean operations.
* How to use Inkscape to create graphics for [[LaTeX]] / [[ConTeXt]] documents.
* etc

A tutorial in progress of writing by John Griessen

This writing is a journal of how a project to recreate a business card originally
made with Illutrator 7, after losing the original file, so the comparison to Illustrator is
much from memory and not to be taken as the last word, but a guide as to how the programs compare.

Attached is a png of the printed business card:

It originally was a collection of paths filled with colors and text objects with grouping to
make replicating some objects easy.

The shell command '$inkscape --version' tells us this is Inkscape 0.39cvs (Jul 2 2004) .

The logo main element is a pseudo sine wave, and I made it before with grid snap and stretching and replicating, so now I set my units to mm and grid spacing and snap to 1 and remember how it would be nice to have major and minor grids instead of just one, so I want to create some vertical guides evenly spaced and cannot remember and start looking in docs. In Illustrator 7, clicking on the ruler bar created a guide if I recall... Once created, it could be moved with grid snap like any object, so getting it on grid or off was easy. As I read around, I find the usage of guides in "Keys and Mouse" "drag off a ruler" is the way... and a guide is on the page, and I can't snap it to easily make the accurate secondary grid I had wanted....Is there a way to? I try duplicate on the guide, but alas, it is not a regular object... it cannot be selected as they are...so I cannot replicate guides to make other grids after all... note for the beginner, to get bezier curves out of the line/bezier tool, you must click-drag. A click-only will give you only connected straight line segments. I'll have to use lines as guides,
http://home.austin.rr.com/jgriessen/ill2ink-tut1.png

=== Other SVG Tutorials ===

* http://www.codeproject.com/books/learnsvgchapter07.asp

Inkscape Wiki - User contributions [en]

Filter Effects

TutorialIdeas