Older blog entries for pippin (starting at number 34)

Spring has arrived

The ice on Mjøsa has melted and spring is rapidly proceeding.

I'm starting to think that I should create a new and better gallery for my images, my recent adventures in the land of web 2.0 has left me with some ideas for how to create a minimalistic system that has only static content on the server which is processed on the client for slideshows, tag based searching and more.

Syndicated 2007-03-28 14:59:03 from codecave.org


Press image below to launch a — XHTML+CSS+js standards compliant, cross browser supported without hacks — implementation of clasiscal digital gamer tennis. Avoid moving your mouse at all after loading to have two "ai's" competing each other.

I've been brushing up my js-fu the last couple of weeks due to extra responsiblities at work that have distracted me from hacking on the usual projects. This has led to a pong game and a popup-index and tagcloud for the static content web 2.0 blog renderer at codecave.org.

Syndicated 2007-03-24 17:32:49 from codecave.org

Robotic Aquarell Vision

When experimenting with an approach to tonemapping I've stumbled across a nice artistic aquarell like rendering filter. This rabbit looks nice with a more basic variation

Syndicated 2007-03-01 00:03:11 from codecave.org

The State of GEGL

The presentation I did at FOSDEM this year is now available online. In multiple forms, a video (300mb OGG/Theora), a large image and a tarball containing the GEGL compatible XML file with included media assets and a ruby program for viewing it.

FOSDEM was a nice experience, the amount of participants increases every year and it is great fun to meet up with people I haven't talked to for a couple of years as well as met a bunch of new people doing amazing things using our free tools and infrastructure.

Syndicated 2007-02-26 13:03:01 from codecave.org

GEGL 0.0.12

A new GEGL release is out, grab GEGL 0.0.12 and babl 0.0.14 now.

Some highlights this release:

  • GEGL has been succesfully built on win32
  • Bindings for C#, Python and Ruby
  • Some profiling induced performence enhancement

Read full announcement

Syndicated 2007-02-18 23:19:24 from codecave.org

GEGL 0.0.10 Released

A new GEGL release is out, grab GEGL 0.0.10 and babl 0.0.12 now.

Some highlights this release:

  • API documentation
  • Internal caches for rendering (internal floating point projection)
  • API for iterative rendering
  • API for querying node connections.
  • improved hit detection (still only bounding boxes)
  • performance enhancements to frequently used code paths.
  • improved relative path handling in test app
full announcement.-

Syndicated 2007-01-28 23:34:28 from codecave.org

Ruby meets GEGL

GEGL is written in C, but I think and hope that interesting applications will surface written in higher level languages. I am having fun combining GEGL Ruby, GTK+ and cairo in a test application that focuses entirely on manipulating objects in a zoomable canvas on the canvas that uses pie menus. The test application and the rest of the code for the user interface resides in the nicely forming rgegl extension for Ruby.

4mb GIF screen capture

It is nice to code in Ruby again, it seems like I can get much more done in one hour with ruby than a whole evening with C.

Syndicated 2007-01-25 23:42:50 from codecave.org

Public GEGL API Reference

Work is under way on documenting the GEGL API. The core of the API is rather small (less than 15 entry points for the core of creating and processing image compositions, and the rest is syntactic sugar or state queries).

Please also look through this API with a critical eye and report thoughts on the API back to the GEGL mailing-list. Improvements to the text itself are best sent as a patch against gegl.h in subversion.

The document is transformed from .h into .html by a ~500 line HTML/CSS/ruby/regexp contraption.

The rest of the web on gegl.org is still the one from the previous release, when the next release is done the API Reference will also be linked from the front page.

Syndicated 2007-01-25 12:06:36 from codecave.org

GEGL 0.0.4 released

The first GEGL tarball, of version 0.0.4, has just been released from the 23rd Chaos Communication Congress in Berlin.

Full release announcement follows:

What is GEGL?

GEGL is a graph based image processing framework offering non-destructive image processing and compositing on large images. GEGL is suitable for projects ranging from small one-off projects to interactive applications.

GEGL is built on top of the libraries glib and babl:

  • GLib is the low-level core library, also forming the basis of GTK+ and GNOME. It provides data structure handling for C, portability wrappers, plug-in handling and object system used for object oriented structuring of the framework.
  • babl is a library for dynamically handling pixel formats and managing conversions between them.

What's new in 0.0.4?

This is the first public release of GEGL.

  • 8bit, 16bit integer and 32bit floating point, RGB, CIE Lab, YCbCr and naive CMYK output.
  • Extendable through plug-ins.
  • XML, C and Python interfaces.
  • Memory efficient evaluation of sub-regions.
  • Tiled, sparse, pyramidal and larger than RAM buffers.
  • Rich core set of processing operations
    • PNG, JPEG, SVG, EXR, RAW and other image sources.
    • Arithmetic operations, porter duff compositing operations, SVG blend modes, other blend modes, apply mask.
      • Gaussian blur.
      • Basic color correction tools.
      • Most processing done with High Dynamic Range routines.
      • Text layouting using pango

The public API is now in a state where extended testing is desirable. The public API is the functions exposed in gegl.h which most applications using GEGL will interface with, either directly or through bindings for a dynamic language. The changes needed as usage patterns emerge are expected to be small.

Although adding new operations now is easy the API used is still considered highly experimental. The file format used for testing is not stable either and is expected to continue maturing.

In the release there is also some sample code exercising the framework, in proportion to the amount of work put into the library almost no time has yet been invested in improving the usability of this GUI.

Where to get GEGL

GEGL, babl and glib can be fetched from:

ftp://ftp.gimp.org/pub/gegl/0.0/gegl-0.0.4.tar.bz2 ftp://ftp.gimp.org/pub/glib/2.12/glib-2.12.6.tar.bz2

The integrity of the tarballs can be verified with:

$ sha1sum *.bz2
8ba35c6eae58fd1f89e2ba1b09f3927d93dec57e  babl-0.0.8.tar.bz2
3476715723d58fd703a72c93c4f82945e7fb23a2  gegl-0.0.4.tar.bz2
30cf64bc5c93d5fbba23ea00fb9270d29fb81f8d  glib-2.12.6.tar.bz2

Where to get more information about GEGL

Information about GEGL can be found in the GEGL documentation, the README is a text only version of the HTML documentation generated during a build. This is also the contents of http://www.gegl.org/.

/Øyvind Kolås @23c3

Syndicated 2006-12-30 00:04:10 from codecave.org

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