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Category: graphics

Multi-column data plotting with Gnuplot

In my previous post I showed how to generate good looking charts with Gnuplot. Those were simple bar charts with a single bar. In this post I want to show you how to plot bar charts with multiple bars. Such charts take multiple columns of data and plot them grouped in the chart. We'll be working with […]

Generating good-looking charts with Gnuplot

Gnuplot is a tool for plotting graphs. It was originally created to allow scientists and students to visualize mathematical functions and data interactively, but has grown to support many non-interactive uses such as web scripting. It is excellent for generating all kinds of charts. Unfortunately, the defaults for Gnuplot don't generate very appealing charts: set terminal […]

Recording Linux desktop with PulseAudio

For a while now I've been trying to record my Ubuntu desktop with various levels of success. I've been using recordmydesktop to do my recording. Recordmydesktop is a simple commandline tool that outputs an .ogv (Ogg Video) file which is a container format that uses the Theora video codec and the Vorbis audio codec. Most […]

Gimp Animation frame speed

The Gimp can do animations by simply using stacked layers as animations. You can preview the animation in the Filters → Animation → Playback. It's rather to figure out how to change the time each frame is displayed though. It turns out you have to change the layer name in order to change the time […]

Change blindness

This is pretty cool. Try to see if you can spot the change that occurs during the flicker (after about 1.5 seconds) in this image: Kayak Now try it in the same image without the flicker: Kayak More information in this paper

Some (Debian) backgrounds

I found some Debian (and one Linux) backgrounds I had created some time ago on my computer. Decided to put them online.

Vexel artsy thingy

Yesterday evening, being the lazy slacker that I am, instead of working on my project, I was surfing around. I went to freshmeat, saw some interesting project, visited the author's homepage, saw a link, got to some other guys website where I read that he was the inventor of the word Vexel. There was a […]

Smoke looks cool

Smoke looks cool. Via J-walk blog

Optical illusion

I'm normally not too impressed with optical illusions, but this one's pretty cool. The cool thing here is how the magenta spots disappear when you stare focus on the cross in the center and all you see is a moving green spot. I'm not sure how it works, but it seems to me the brain […]

Perry Bible Fellowship

Cool online strip