[PD] Converting colours to sound

tim vets timvets at gmail.com
Tue Apr 7 18:35:09 CEST 2015

Hi Claude,
Interesting stuff!
I triend to run your patch, but I get "./recog~: can't load library"
(and pd seems to go into a "watchdog: signaling pd..." loop as soon as I
create the Gem window, don't know if that's related).
I can't find 'recog~' anywhere on my system.
hint welcome.

2015-04-07 17:58 GMT+02:00 Claude Heiland-Allen <claude at mathr.co.uk>:

> Hi Antonio,
> On 05/04/15 15:51, Antonio Roberts wrote:
>> I've been studying the work of Neil Harbisson for awhile and I'm
>> looking to try and replicate in part the functionality of his eyeborg
>> using Pure Data. I have already built a simple patch to convert pixels
>> to sound but now I want to expand on it. Here's my initial research:
>> http://www.hellocatfood.com/sonification-studiespixel-waves/
> "I predict the development of an image to audio sequencer in the near
> future."
> I made a painting program in gridflow years ago, had some very basic
> sonification - gridflow also had a "how to play a car" example converting a
> photo by scanlines into audio with FFT.
> https://archive.org/details/ClaudiusMaximus_-_Emulsion
> https://archive.org/details/ClaudiusMaximus_-_DohPaintII_Session_3
> https://archive.org/details/ClaudiusMaximus_-_DohPaintII_Session_2
>  Colours don't directly relate to sound and so Harbisson and others
>> must use a scale to assign colours to sounds. Some initial research
>> brought these up:
>> http://blogs.plos.org/neuroanthropology/files/2014/
>> 03/Harbisson-The-Sound-of-Colors-TED.jpg
>> http://www.bbc.co.uk/news/magazine-16681630
>> http://www.lunarplanner.com/Harmonics/planetary-harmonics.html
>> http://www.flutopedia.com/sound_color.htm
> The last one, in the section "Converting RGB Colors to Color Frequencies",
> makes a good point - monochromatic wavelength to RGB works fine, but RGB to
> wavelength is in general impossible, as colours are spectral power
> distributions over continuous wavelengths.  Once it's flattened to RGB, too
> much information is lost to be able to recreate the original spectrum (aka
> metamerism, where 2 different spectrum give same colour sensation).
> Recently I copy/pasted some colour-related stuff from Wikipedia into a
> booklet (second link is layed out for printing, first one is better for
> screen reading, both have the same content):
> http://mathr.co.uk/misc/2015-04-04_colour.pdf
> http://mathr.co.uk/misc/2015-04-04_colour_booklet.pdf
> The approaches you linked seem to convert wavelengths to colour in a
> straightforward way, but for converting from colour to sound I think a
> different approach would be better (and indeed needed) - something more
> akin to the Munsell perceptual colour system:
> https://en.wikipedia.org/wiki/Munsell_color_system
> a grossly simplified version would be HSV, which I used in the attached -
> a bank of vcf~ fed by noise~, mapping hue to scale note, value to loudness
> and pitch, and saturation to filter Q - so that white would give high
> noise, grey gives a lower pitch noise, black gives silence, fully-saturated
> dark green gives a low note, bright green gives a high pitch at the same
> scale note.  the filters glitch when the hue jumps from 0 red (orange side)
> to 1 red (purple side), could be fixed with some cleverness probably.
>> Can anyone think of a way to translate this into pd? In the end I
>> would like to be able to display a block of colour on screen and have
>> that generate a specific note.
>> Any help is appreciated.
>> Antonio
> Claude
> --
> http://mathr.co.uk
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