What is Digg?113 Comments
- Egoist, on 10/12/2007, -0/+28The dumb is strong with this one.
- cryonix, on 10/12/2007, -1/+27HOW TO: in photoshop, change the image mode to CMYK, and make a copy of the layer. Desaturate the bottom layer (image>adjust>desaturate). The top layer you want to flip the color spectrum 180,(dont use the invert comand you'll see why if you do) use Hue/Saturation (Image>adjust>hue/saturation) and move the hue slider to 180 (-/ doesnt matter). stare at your inverted image, then hide the top layer to reveal the bottom desaturated layer to see the illusion.
MY 2 Cents: i could be wrong...
after over stimulation of color the ability to sense that color atrophies, resulting in the temporary and very trivial loss in the ability to see that color, seeing the effect of the atrophy is most noticable when looking at white (contains all colors Cyan, Magenta, Yellow) by looking at solid Magenta the after image on white will look Green, because you cant see magenta as well but you still can see Cyan and Yellow which mix to green... find yourself a CMYK color wheel and you can make the same effect. - theone3, on 10/12/2007, -3/+26Wikipedia: "Cone cells are less sensitive to light than the rod cells in the retina (which support vision at low light levels), but allow the perception of color. They are also able to perceive finer detail and more rapid changes in images, because their response times to stimuli are faster than those of rods. Because humans usually have three kinds of cones, with different photopsins, which have different response curves, and thus respond to variation in color in different ways, they have trichromatic vision. "
My Interpretation (This may not be true - I'm guessing here): Because the variations in colour in the original image are small, you'd be using your rod cells to detect them. Because there is a reasonable level of variation in the rollover image, you'll be using your cone cells (which respond to stimuli faster) to detect them. The illusion of the colour image is the overlap of rod cone response rate. What I'm not clear on is this: Cone cells do colour better than rod cells. Something much more complicated than that is going on here, but I don't know much about biology, the brain, or the eye, so that's as far as my interpretation goes.
http://en.wikipedia.org/wiki/Cone_cell
http://en.wikipedia.org/wiki/Rod_cell (cell response time curves for different color wavelegnths displayed on both) - twertyto, on 10/12/2007, -2/+25Now that actually is amazing. Explanation?
- johnsto, on 10/12/2007, -2/+20Ok, this is a quick explanation.
There are two images - the first is a normal luminance image (black&white). The second is an image containing only the chroma (colour) information, but reversed/inverted.
Staring at the chroma image floods your eye receptors with colour information, and after 4 or 5 seconds your brain attempts to cancel the effect out in an attempt to adjust. It basically means the brain has inverted the chroma image back to it's original colours, and it overlays that on top of the image - so it starts to look grey and the colour seems to slowly fade
Then, when you switch to the luminance (b&w) image, the brain continues to overlay its adjusted image (with the right colours) on top of the new one, thereby taking the luminance (b&w) information from the image, and the chroma (colour) information from your brain to create a complete and accurate colour picture. After a few seconds we adjust again and the colours disappear.
Hope that makes sense. Our brains are rather smart at doing things like this - Hella, on 10/12/2007, -0/+17I don't trust my mind anymore
- MacHarborGuy, on 10/12/2007, -1/+15yes, yes it is, but the optical illusion dealing with the saturation of the eyes with specific colors is the whole basis.
Try wearing red/blue 3d glasses for about 2 minutes, then take them off and look thru each eye individually. The one that had the red in front of it sees more blue, and the one with the blue sees more red. You had so much of those specific colors in front of you, that it becomes much harder to perceive the more subtile levels of them and instead are bombarded with every other color opposing them. That is why the light blue sections of first image turn green when the black and white details are shown.
Fun little optical trick. Spotted it on myextralife.com a few days ago. Nice that it has hit digg. - vermin, on 10/12/2007, -1/+15Holy crap I didn't expect it to work so well. Stunning.
- Egoist, on 10/12/2007, -1/+15Welcome to the club. Our meetings are on Thursday nights. Bring donuts.
- Elxx, on 10/12/2007, -1/+12These are really cool. Here's another illusion from the same guy:
http://www.johnsadowski.com/2006/05/lil-color-illusion.html
Also something related. Stare at this for 30 seconds then look at a white wall. Fun stuff.
http://home.versateladsl.be/vt637630/img2/afterimage_flag.gif - spazzium, on 10/12/2007, -2/+13You guys are close on the effect. This is actually caused by an effect known as the opponent color theory. Basically for every neurochemical related to a particular color there is an opposite one for the opposite color. These are interdependent and work in cooperation to allow you to see colors. Each neurotransmitter is generated by your cells at a normal rate and they are normally in balance. When you are staring at the picture you are depleting the neurotransmitters used for those particular colors. When the colors go away (when you hover over for the b&w picture) the opponent color can now overwhelm the depleted opposite neurotransmitter. The desaturated b&w picture provides shading and the opposite transmitter simulates the colors. In a moment the depleted neurotransmitter returns to its normal level and regains balance with its opponent.
- Alegis, on 10/12/2007, -1/+11Yep. When I moved the mouse over I thought : "Hey what the hell this is just a colored onmouseover event. Although it suddenmly turned black and I did it again. Checked the source code.
Very neat. One for the collection. - nawitus, on 10/12/2007, -0/+10Actually it works, and is not a joke.
- mrASSMAN, on 10/12/2007, -0/+8congrats, you're a moron.
- superdigg, on 10/12/2007, -0/+8awesome! also hilarious how many people are doing this wrong and thinking "they haven't been fooled by computer trickery".
- balsaq, on 10/12/2007, -0/+7I didn't realise javascript could see you looking at an image to know wether to make it colour or black and white...
/sarcasm - InternetUser, on 10/12/2007, -0/+7How could you be so wrong, dearest mapkinase?
b/w image: http://www.johnsadowski.com/2006_stuffs/manzana2.jpg - jjborzych, on 10/12/2007, -0/+7Sick! This is Crazy! Who cares if this isnt the first person to do it, it doesnt make the illusion any less cool
- ThinkBox, on 10/12/2007, -0/+7AH!! MY EYES! the goggles do nothing!
- FutureSandwhich, on 10/12/2007, -1/+7Astonishing.
That is really freaking cool.
Is there a specific way to make an image like that? - spazzium, on 10/12/2007, -1/+7You obviously didn't read or understand my post.
Your first paragraph is nearly restating my explanation. Your second paragraph is describing a totally different phenomenon. Motion detection and color receptors do not really work the same way. Especially by the time you starting combining information further up the visual pathway.
The closest one here is indeed The0... mine is simplified a little too much.
Graduate of Purdue University and holder of a mostly useless BLA in Psychology -- 2 years ago. - bluekangaroo, on 10/12/2007, -0/+6You think its a joke? Try keeping the image half off the screen and alternating moving your mouse off and on the image. You'll see the image alternate from the negative color one to the black and white one without any normal color transition
I think there are a few people here who seem to have forgotten that little optical after image trick from elementary school. Read some of the excellent explanations from the comments above.
Not everything is a computer trickery. - theprez, on 10/12/2007, -0/+6WTF? Didn't it work for you? This is NOT a joke. Read carefully. There are 2 images. A black and white image and an image with colors on it. After staring at the dot in the colored image for 30 seconds and then switching back to the black and white image (by pointing the mouse to the image), it looks like if it was originally colored. The effect last longer if you don't look away or blink.
- theprez, on 10/12/2007, -1/+7It's funny to see some seem to think they're just trying to be fooled by a rollover imageand that this is actually joke... Or maybe they're just color blind?
- cwcheang, on 10/12/2007, -1/+6More
http://wohba.com/pages/colorlogan0606.html
http://illusionsetc.blogspot.com/2006/05/how-to-create-your-own-colorization.html
http://www.psy.ritsumei.ac.jp/%7Eakitaoka/zanzoe.html
#digg @ircdalnet - The0, on 10/12/2007, -1/+6There is an explination for all this.
There are a few theories out there explaining how the eyes see color, among them being the tri-chromatic theory and the opponent process theory. The one at work here is the opponent proccess theory. According to this thoery, the eyes see color in 'scales.' By scales, I mean this: http://www.nycenet.edu/opm/images/scale.jpg , not this: http://www.taos-telecommunity.org/epow/EPOW-Archive/archive_2005/EPOW-050523_files/Crotalus%20cereberus%20dorsum%20scales.jpg
Now, there are four scales, three of which have a color on one side and its complimentary color on the other (e.g., red and green, blue and orange, purple and yellow), and the fourth having white and black on the other. According to the opponent process theory, if you stare at a color long enough, it will 'wear out' the scale by putting too much 'weight' on the one side. When that color is taken away, the weight is lifted and the scale abruptly tilts, and in doing so tilts in the opposite direction temporarily. So if you stare at green for a long time, look away and you'll see red.
What they did was invert the color values of the original picture. That way, when you stare at it long enough and then change the image to black and white, the tilting scales result in you seeing an accurately-colored image. Its kind of like those "stare at this weird blob for thirty seconds, look away and see Jesus" pictures, just more complicated.
Its amazing the things you learn in AP Psych. - inactive, on 10/12/2007, -0/+4*drops jaw*
- threepio, on 10/12/2007, -15/+18In university about $40 would get you the raw materials to do that to just about any picture.
The whole being covered in spiders or thinking you could fly thing notwithstanding. - Yarnage, on 10/12/2007, -3/+6sam830: You're an idiot. It's SUPPOSED to do that. That's not the illustion. When mousing over it shows a black and white image but if you follow the directions, it'll look like it's in full color when you mouse over.
- Ignignokt01, on 10/12/2007, -4/+7I figured out how to do this in photoshop just now. It works almost as well as this one, and its very simple.
Take a big picture in photoshop, and duplicate the layer. Make the bottom layer black and white. Then select the top layer, and press CTRL I (invert the colors). Then press CTRL U and make the colors as saturated as possible, it doesn't really matter if they get all f'ed up like they do when you oversaturate. Then just stare at one spot, or you could make your own little black dot, for 30 seconds. Then just hide the top layer and it basically achieves the same effect.
EDIT, damn too late, cryonix got it first. His way is better, although it still works if you don't convert it to CMYK - estacado, on 10/12/2007, -2/+5Yes. Go see a doctor. You're seeing things that are not there. Do you see dead people too?
- saralk, on 10/12/2007, -1/+4the mouse over image is black and white, you can try it before you stare at the dot
- Bassguy, on 10/12/2007, -0/+2That was awesome. That is one of the best optical illusions I have ever seen. Nice find, sir.
- gunmod, on 10/12/2007, -0/+2This is a cool find. Big Digg
But 30 seconds? I did it for like 2 seconds and it worked.
Wild - nmdotcom, on 10/12/2007, -2/+4i thought it was fake. i figured when u roll your mouse over it would display a color image, until i moved my eyes slowly across the image the color slowly disappears and then I was like nice
- InfamousX241, on 10/12/2007, -0/+2Haha I thought it was a joke when I mouse-overed, then I moved my eyes and saw it fade B&W rapidly. Coolio.
- Lewiji, on 10/12/2007, -0/+2You're an idiot. The mouseover changes it to the black and white image, as has been said many times to other people who didn't bother looking at it properly
- balsaq, on 10/12/2007, -0/+2What is cool is that once you have concentrated on the dot and have hovered over the image it goes black and white if you look away from the dot, and back to colour if you look towards the dot again (I found this repeatable). Unless that's just my messed up eyes...
- cwcheang, on 10/12/2007, -1/+3Amazing.
- Agret, on 10/12/2007, -1/+3Funny that it says 30 seconds. It only takes 1 second for me.
- inactive, on 10/12/2007, -2/+4dude you just made a total ***** out of yourself.
oh the irony, it fooled you so completely you think it's actually a colour image, and your calling us fools for thinking it's not really a black and white image! - cryonix, on 10/12/2007, -0/+2added to the How To...
you can remove the black from the top layer to be more like the illusion. select the top color layer, go into the channels and fill in the black channel with white.
EDIT: ^^ sorry ^^ :) - trib4lmaniac, on 10/12/2007, -1/+3I'm hoping you're not actually as retarded as you seem. Perhaps you're being sarcastic?
- sideral, on 10/12/2007, -0/+2" Yep. When I moved the mouse over I thought : "Hey what the hell this is just a colored onmouseover event. Although it suddenmly turned black and I did it again. "
Maybe it was an oneyemove event :) - spazzium, on 10/12/2007, -1/+3Specific cells never determine a color. Rods and Cones are way too small and way too weak in and of themselves to generate the signals alone. Without going into too much detail (there's lots of detail), groups of cells combine their data with cells higher up in the system. Only by combining information in several steps can your brain make sense of the huge array of receptors. Your other problem seems to be the firing itself... which is just the generation of neurotransmitter, in this case a protein. When most people hear the term firing in this context they immediately envision some kind of electical signal. But the visual system and the entire brain work by combining chemical neurotransmitters with the more commonly thought of electricity like effect. By the time the signal resolves to the optical nerve the function is much closer to the electricity like properties you're thinking of. (It's still chemical in nature but operates on properties related to electricity.) Ok too much detail... it's too much work to explain all this in a comment box. If you're interested in this stuff attend Purdue and take Cognitive Psychology :)
- nathstar, on 10/12/2007, -1/+3Yep, the dumb is strong with this one too
- sirmithras, on 10/12/2007, -0/+1yeah they continually trick you
- trib4lmaniac, on 10/12/2007, -0/+1It says on the page write up that the colouring will stay for as long as you keep your eyes focused on the dot.
It's pretty damn cool; I can keep the colour there for ages. - npdcrazypyro, on 10/12/2007, -0/+1Yeah, but because the black and white image is displayed of the same thing, your brain puts the color onto the black and white image making it look MUCH more real.
- TheKillDoctor, on 10/12/2007, -0/+1Naw they just don't know how to read, they just click on links expecting everything to be self explanatory. Actually I'm just being nice. They're actually proving that just because a person owns a computer doesn't mean they're actually intelligent. Which is the long way for saying they're a dumbass.
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