[Pd] Playing a bitmap

Claude Heiland-Allen claudiusmaximus at goto10.org
Tue Jan 23 06:57:02 CET 2007

Chuckk Hubbard wrote:
> On 1/23/07, Claude Heiland-Allen <claudiusmaximus at goto10.org> wrote:
>> Chuckk Hubbard wrote:
>> > Has anyone done this with Pd?  I thought I remembered something in
>> > GEM, but I can't find it anywhere.  Just to have a cursor scroll left
>> > to right and assign the different values of pixels to different
>> > musical properties...
>> >
>> > -Chuckk
>> >
>> Like this?
>> http://gridflow.ca/gallery/photo_pianoroll.pd.gif
> Yeah, I think so.  How's it work?
> Thanks for sharing.
> -Chuckk

Not sure exactly, it's not my patch, but from the screenshot it looks 
like it copies a scanline of greyscale pixels into an array, then 
rescales the array exponentially into annother array (frequency<->pitch 
conversion), then does an inverse fft and sends the resulting audio to 
dac~; the partials of the output sound being determined by the 
particular scanline of the image that was just copied to the array.

I think this technique is a form of "scanned synthesis", but I'm not an 
expert on terminology.  At least searching pd-list for that term shows 
up some interesting results...


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