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HelloKitty
08-06-2006, 20:03:02
http://www.johnsadowski.com/big_spanish_castle.html

Vincent
08-06-2006, 20:06:46
Magic!

Vincent
08-06-2006, 20:07:33
Spanish castle magic even!

Gary
08-06-2006, 23:04:39
Bandwidth Limit Exceeded

Shining1
08-06-2006, 23:54:32
Wow...

Gary
09-06-2006, 00:23:29
Ah you guys have stopped taking up all the bandwidth. Um yeah, not bad.

Immortal Wombat
09-06-2006, 02:07:02
That is quite cool. Does anyone know what kind of transform the image is put through to produce the "negative"?

Immortal Wombat
09-06-2006, 02:29:17
Oh, nevermind. It's just a negative with additional murkiness.

KrazyHorse@home
09-06-2006, 02:29:46
It looks like a simple 3 colour intensity negative.

Given an intended RGB intensity of R1 G1 B1 and a B/W RGB intensity of WWW (all three equal), I think the RGB intensity of the "negative" is probably R2 G2 B2 where R2 = W - R1, G2 = W - G1 and B2 = W - B1

Your eye responds only to the difference between the negative and the B/W, so it sees R1 G1 B1

KrazyHorse@home
09-06-2006, 02:47:46
Hmm, not quite. That's definitely the trend, but there's something more complex going on.

KrazyHorse@home
09-06-2006, 03:07:11
Here's what happens when I take the "negative", invert it, then add the B/W image with 62% opacity:

http://mmcevoy.googlepages.com/castlefinal.jpg/castlefinal-full.jpg

Immortal Wombat
09-06-2006, 03:16:24
Yeah, add about 40% more contrast and it's almost exactly the source image.

http://ermsays.net/manzana.jpg

Immortal Wombat
09-06-2006, 03:25:15
And anyway, why not just use a normal negative (http://ermsays.net/bsc.html)? 'cept it's more obvious, I suppose.

KrazyHorse@home
09-06-2006, 03:48:34
It probably doesn't give the same effect, dude.

KrazyHorse@home
09-06-2006, 04:18:16
Oh, never mind. You already did it. I was playing with it and got results to work similarly by doing the inverse transform of what we've been talking about...

Drekkus
09-06-2006, 11:24:36
Originally posted by KrazyHorse@home
It looks like a simple 3 colour intensity negative.

Given an intended RGB intensity of R1 G1 B1 and a B/W RGB intensity of WWW (all three equal), I think the RGB intensity of the "negative" is probably R2 G2 B2 where R2 = W - R1, G2 = W - G1 and B2 = W - B1

Your eye responds only to the difference between the negative and the B/W, so it sees R1 G1 B1 Ooooh, magic!

Immortal Wombat
02-07-2006, 15:53:23
'nother one (http://www.fretmasters.com/illusion/)

Scabrous Birdseed
02-07-2006, 16:38:00
What I believe has been done to the image is a Hue/Saturation/Lightness separation of the inverse with only the hue and saturation portions retained (essentially the equivalent of setting the whole image to 50% lightness, fairly easy to do with filters). Since a black and white image supplies the lightness values, together they make up the "complete image".

Vincent
02-07-2006, 19:04:32
I prefer the term "magic"

C@H
02-07-2006, 19:24:18
~ma chick~

C@H
02-07-2006, 19:26:34
I prefer this (old but still good) one:

http://www.youtube.com/watch?v=vzSRVgF501M

zmama
03-07-2006, 02:30:14
*blink*


C@H??

Nah...just an optical illusion

Vincent
03-07-2006, 20:17:49
Not a good one though

Immortal Wombat
02-12-2006, 03:18:32
answer (http://www.johnsadowski.com/color_illusion_tutorial.html)
which I think is what Scabby was saying.

JM^3
02-12-2006, 03:39:57
didn't owkr

JM

Scabrous Birdseed
02-12-2006, 08:59:08
Yeah, that's a different method to achieve the same thing, using a "foreground color fill" (ie filling the hue+saturation) with 50% luminescence.

Provost Harrison
02-12-2006, 14:32:32
I can add the other geek angle if you want (the biochemical one)? ;)

paiktis
03-12-2006, 19:20:41
doesn't your brain get damaged if you do these tricks all the time?
(more damaged)