Blog Archives

Pretty squiggles

Here’s an image that came out of something I was working on this morning. I thought it might make an interesting border somewhere. The blue line is sin(x), the green line 0.7 sin(φ x), and the red line is their

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R without Hadley Wickham

Tim Hopper asked on Twitter today: #rstats programming without @hadleywickham’s libraries is like ________ without _________. Some of the replies were: (skydiving, a parachute) (gouging your own eyes out, NULL) (dentistry, anesthesia) (shaving, a razor) (internet shopping, credit card) Clearly

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Interview with Michael Hammel, author of The Artist's Guide to GIMP

Michael J. Hammel is the author of The Artist’s Guide to GIMP, a book I reviewed three weeks ago. The following interview is based on my correspondence with Michael.

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The Artist's Guide to GIMP

Learning how to edit images has been on my to-do list for a long time. I do some very basic editing with Paint.NET, but I keep meaning to learn to use GIMP. I heard years ago that GIMP is terribly

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The Book of Inkscape

When I first started using Inkscape, I read Inkscape: Guide to a Vector Drawing Program by Tavmjong Bah, 3rd edition. It’s now in its 4th edition, which I have not seen. I received a copy of The Book of Inkscape

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Thoughts on the new Windows logo

I appreciate spare design, but the new Windows logo is just boring. Here’s the rationale for the new logo according to The Windows Blog: But if you look back to the origins of the logo you see that it really

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2010 calendar of lost mathematical art

Rod Carvalho wrote a post this morning announcing a beautiful 2010 calendar created by Ron Doerfler. Doerfler’s blog is entitled Dead Reckonings: Lost Art in the Mathematical Sciences. The calendar is an example of such lost art. It is illustrated

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Including LaTeX in an Inkscape drawing

My previous post described how to include an Inkscape drawing in a LaTeX document. This post describes how to use LaTeX in an Inkscape drawing, which is probably more useful. The LaTeX output is included not as bitmap but as

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Including an Inkscape drawing in LaTeX

The Inkscape drawing package can export to a large variety of vector drawing formats, including LaTeX. If you save your drawing to a file foo.tex, you can include the file in a LaTeX document as follows. \documentclass{article} \usepackage{pstricks} \begin{document} Testing

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Function plots in Inkscape

Why would you want to plot a mathematical function using a drawing package like Inkscape rather than a mathematical package like Mathematica or R? One reason is that you may want plot for its visual properties. For example, you might

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Bezier basics

Bézier curves are very common in computer graphics. They also interesting mathematical properties. This post will give a quick introduction to Bézier curves, describing them first in visual terms and then in mathematical terms. There are different degrees of Bézier

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Same color illusion

Are squares A and B are the same color? I found this illusion on John Baez’s site. It was created by Edward Adelson in 1995 and is the subject of a Wikipedia article. Related post: Optical illusion, mathematical illusion

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More on colors and grayscale

My previous post gave three algorithms for converting color to grayscale. This post gives more examples and details. The image below is a screenshot from an Excel spreadsheet illustrating color values and how the convert to grayscale. The R, G,

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Three algorithms for converting color to grayscale

How do you convert a color image to grayscale? If each color pixel is described by a triple (R, G, B) of intensities for red, green, and blue, how do you map that to a single number giving a grayscale

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Back to school

Here’s today’s image from The Retro Press, a back-to-school ad from the September 9, 1957 issue of LIFE. The Retro Press blog highlights advertisements from the Gallery of Graphic Design.

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