CPAN reports colors

search.cpan.org has, on each distribution page, a link to CPAN testers reports, and, thanks to Slaven Rezic, to matrices that neatly summarize the report statuses per distribution or per author (here's an example for Safe 2.15).

Unfortunately, the default color scheme isn't really readable for color-blind people. However, Slaven used a less known feature of CSS to provide an alternate colouring scheme. In Firefox, when viewing the matrix page, select View > Page Style > High Contrast to get the alternate CSS, et voilà, the colours are now accessible. Thanks Slaven!

Blue versus Pink

Found via slashdot, an article on Bad Science criticizing a research in evolutionary psychology about why boys prefer blue, and girls pink. The author says, and rightly:

The “girls preferring pink” thing is not set in stone, and in fact there are good reasons to suspect it is culturally determined.

And then he gives examples. But if I may add another remark to his rant: it turns out that the categories of blue and pink are also culturally determined. Actually, the colour blue didn't even exist as a separate entity before the Middle Ages. Ancient Greek, for example, does not have a word for blue, and Homer speaks about the wine-coloured sea.

I think that the study of colours and their perception is more a subject for historians than for biologists or physicists. On this subject, one of the best books I've read is Blue, the History of a Color, by Michel Pastoureau, in which the last chapter briefly talks about the very recent (and very occidental) association of blue and pink to boys and girls, respectively.

Do you dream in colour?

Do you dream in color? asks Mark-Jason Dominus. Interesting question, on which I've already some thoughts.

I'm colour-blind. I see some colours, but the words that are used to describe colours are for me largely arbitrary. Why use two different words, like, green and orange, for the same colour? A consequence of that is a difficulty to verbalize colours, which in turn makes it difficult for me to remember the colour of an object, if nobody told me what word to use to describe it. Without a proper vocabulary to classify them in my brain, I can't remember or percieve fully the colours.

So it shouldn't be a surprise that I dream "in black and white": or, more accurately, that I can't name and remember the colours of the objects that appear in my mind during dreams. Colours are an irrelevant part of my Weltanschauüng.

However, from time to time, I make a dream about a colour. Those are in general very simple dreams, focused on a single object; nothing happens; sometimes I only dream about a colour without an object. (Robert Louis Stevenson, in A Chapter on Dreams, says that he sometimes dreams about a particularly horrible and uncanny hue of brown.) And usually that colour is mauve, or the idea I have about what mauve should look like: a mix between red and blue, which does not exist for me in the real world.

I'm not sure how to explain this. Probably my brain is playing tricks to iself (that is, to me): my eyes are not able to send the signal mauve to the brain, but the brain circuitry is intact and is able to perceive mauve once the eyes are out of the loop. However, that new colour is so strange that it soon overrides all other aspects of the dream it appeared in. I don't have any other explanation (short of the Platonician thesis, that learning is remembering.)

Accessibility bookmarklet

Here's a small bookmarklet to underline hyperlinks. I've added it to my Firefox bookmark bar under the simple name "_". It is very handy when some poorly designed sites have a CSS where links are both (1) not underlined, and (2) in a colour quite close to the colour of the regular text. That happens quite often (esp. to colour-blind web users...)

"Irina Palm" colours

I'm seeing in the streets posters for a new movie, Irina Palm. The posters look like this:


It probably looks fine to most readers, and I must say that it's almost readable for me and my colour-blind eyes. But the paper posters are completely monochromatic to me, even when I'm close, and I had to ask another person to know what was written. That sucks. Conclusion... Don't use color combinations that cause problems for people with color blindness in its various forms. (That's from the W3C HTML 4.01 Specification, section 6.5.1).