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Index › Discussion › Exhibition › rgb petri
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rgb petri (Read 1434 times)
_jeremy
rgb petri
Jan 1st, 2008, 1:49am  
http://jeremyawon.info/rgbp/

each perimeter pixel copies itself outward, with mutating color.

you can affect where the pixels grow by left click+holding - it looks a bit like adding antibiotic to a petri dish.

to adjust the radius of the field affecting pixel growth, right click+hold and make circular motions.

this url parameterizes the applet (to decrease growth, for example):

http://jeremyawon.info/rgbp/index.php?mmin=-4&mmax=5&a=0.4&limit=4000&growth=0.01

mmin/mmax = mutation range
a = fall off of field
limit = maximum number of pixels to copy outward per frame
growth = portion of perimeter to copy outward per frame
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« Last Edit: Jan 1st, 2008, 10:01am by _jeremy »  
 
st33d
Re: rgb petri
Reply #1 - Jan 1st, 2008, 4:55am  
Very good. Looks like a water colour.

Do you have source code to share or is this proprietry?
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antiplastik
Re: rgb petri
Reply #2 - Jan 1st, 2008, 3:33pm  
yep! very nice... looks like lava too Wink
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_jeremy
Re: rgb petri
Reply #3 - Jan 3rd, 2008, 6:59pm  
st33d:
i should clean up the source and share it, but as much as i like the effect im not convinced the implementation is as elegant as it should be Tongue
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« Last Edit: Jan 8th, 2008, 11:47am by _jeremy »  
 
deathbob
Re: rgb petri
Reply #4 - Jan 4th, 2008, 5:16pm  
yeah this is a neat one, source would be nice to have.  I promise not to make fun !
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andyclifton
Re: rgb petri
Reply #5 - Jan 6th, 2008, 12:06am  
Jeremy, hope you don't mind but I liked this trick so much I wrote a version myself to experiment with. You can see my version here. I've been trying to come up with a way to apply this to an existing image, as a "painterly" effect. There's some in-progress results further down the page.
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dek
Re: rgb petri
Reply #6 - Jan 6th, 2008, 8:45pm  
Jeremy, nice one! That's what I love about generative graphics; a simple idea that produces beautiful complex output.

Andy, I like your version of the painterly effect on the image. One thing: the webpage produces a "Loading Java Applet Failed..." with me (the source works fine in Processing).
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How to format code for discourse | eightohnine
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andyclifton
Re: rgb petri
Reply #7 - Jan 7th, 2008, 1:10am  
dek: That's odd, it works on all the machines I have here. In any event, I've cleaned up the source a bit and re-exported, so perhaps it will be better behaved. I'm going to try adding bump-mapping, to see if I can get an impasto effect.
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dek
Re: rgb petri
Reply #8 - Jan 7th, 2008, 2:26am  
My bad, I just checked  with Firefox and Camino and the sketch works flawlessly. Seems to be something with Safari (OS X Leopard).
I very rarely encounter a sketch not loading in Safari, not nearly often enough to recognize a pattern. So I can't say if it's a general Safari bug with a certain code or just my copy that's got a hiccup. Anyways, the fault's not yours...
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How to format code for discourse | eightohnine
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_jeremy
Re: rgb petri
Reply #9 - Jan 8th, 2008, 11:48am  
andyclifton: the soft effect of averaging+mutation looks great! and thanks for sharing your source. seeing someone else's implementation is interesting. my source is also up now (a mess - sorry).

i track the perimeter so that it doesn't have to iterate over the entire grid each step. this should allow the applet to scale for a larger area - an idea i'd like to try is running this on one of those ftir multi-touch screens, with any screen contact having the same effect as left click+hold. projectors are so expensive though :\
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tomgupper
Re: rgb petri
Reply #10 - Jan 8th, 2008, 11:29pm  
Lovely!
It really has the feel of an abstract watercolour painting.  Beautiful effect.
I'd love to see a second mutation blend in on top of the first one - constantly changing generative artwork.
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knectar
Re: rgb petri
Reply #11 - Jan 11th, 2008, 6:31pm  
this is a nearly perfect simulation of crystal growth experiments that I did using Napthalene (like moth balls) grown between plates of glass, and observed under cross-polarizers under the microscope. Wow.
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