writing my own computer brush

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rouncer 103 Sep 04, 2012 at 23:39

boogieman.png

i made that simply by adding rgb till i hit a clamping point, kept precision before 0 and after the clamping point, and you can subtract and add it through the clamping point.
I swear this makes photo production easier, anyone heard of this before?

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Alienizer 109 Sep 05, 2012 at 02:53

Very interesting! but I have no idea how this works!

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rouncer 103 Sep 05, 2012 at 03:59

its really cool!
well just say you stopped getting brighter at 0.5. thats the basic gist.

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Alienizer 109 Sep 05, 2012 at 04:17

hmmm, but you add rgb values until a clamping point, which comes from where?

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rouncer 103 Sep 05, 2012 at 04:30

to make this:

computertenebrism.png

here i start with a peach sillouette (pretty poorly drawn)

then every brush stroke, i remove a little red, more green, and even more blue.

when i hit say approx 0.7 red i stop adding red, 0.6 green i stop adding green, 0.5 blue i stop adding blue.

its cool stopping per channel unique so you can get a glow effect around the ending cell.

the tricky thing is you do it on a floating point texture so you can go past and back the clamping point. (so the brush works in reverse)

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rouncer 103 Sep 05, 2012 at 05:58

rinse and repeat twice with slightly different settings.

aliendudel.png

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Alienizer 109 Sep 06, 2012 at 03:30

Very clever! I can just imagine what effect it’ll do on real pictures! have you tried?

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rouncer 103 Sep 06, 2012 at 16:28

im trying im trying, its still in early stages…

ive actually worked a little more, but this came out too deep tanned, im remedying the situation right now. (im going for photo finish now, but go easy on my results, still early stages like i said)

flat,550x550,075,f.jpg

(another interesting failure)

flat,550x550,075,f.jpg

i know what im doing wrong, ive actually got another pic thats slightly better tuned to natural skin, but i havent uploaded it, besides i can do better just gotta have another go.

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Alienizer 109 Sep 07, 2012 at 00:03

It looks very artistic, I mean, looks like a paiting by hand, not from a computer!

What if you use an HDRI?

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rouncer 103 Sep 07, 2012 at 17:50

flat,550x550,075,f.jpg

funny you say HDRI, because im actually using a high precision floating point texture for the brush strokes themselves, before clamping off. im happy with this result, ive worked out im too lazy to bother making something epicly neat and real, this will just give me the basics. clamping off rgb at different speeds is all you need to do - it is good enough for sss effects, ok, this is over with.

* rouncer farts, the thread is closed *