This week the blog is turning into a bit of an illusion fest. Last week I posted a wonderful contrast illusion. I wondered whether it might be possible to use the concept to create a more concrete image. Something that might enhance the effect by fitting in with people’s expectations about colour. A few nights ago I woke-up from a dream with this image of a world map fully formed in my head…..
The ‘green’ of the land is the same colour as the ‘blue’ of the sea. What do you think? Any other ideas?
Update: The people who read and comment on this blog never cease to amaze me! Matthew Wilkes (tonicblue) has just posted this much improved version….Genius! Not sure the colours are right in the re-sized image below – go to the original here.
July 8, 2009 at 7:36 am |
Je JPEG format skews a lot of the original colors and messes up both part of the illusion and clean verification. Both the compression ringing and the anti-aliasing introduce a lot of improper hues and blur the image detail.
Please create a properly-scaled PNG file, and post that.
July 8, 2009 at 8:52 am
GIF is OK too
July 8, 2009 at 7:39 am |
How about trying a “light and shadow” picture of your face?
July 8, 2009 at 7:41 am |
Nice! But verification is really not that easy.
July 8, 2009 at 7:41 am |
It’s not exactly the sam color … very close, but not the same green. Perhaps the downsize and compression made that.
Source file, maybe?
July 8, 2009 at 7:42 am |
Yeah, they look like different colors to me, but if I let my eyes go out of focus, I can see that they are the same color. So it’s just a bunch of bars of the same color blocking a world map in the background.
July 8, 2009 at 8:07 am |
I’m not seeing the same effect of the green itself appearing a different colour. Instead, the dithering effect of mixing colours seems to dominate to create the map effect-eg magenta includes blue, where as orange doesn’t; I believe this is more an effect of the eyes rather than brain?
I used to use such colour dithering many years ago on computers with only 8 colours to simulate a much larger pallet. The old game “Citadel” on the BBC micro used it very well throughout as an example.
The perception that the green stripes are actually using different colours is still there but only very slightly, but the stronger dithering effect dominates the image.
July 8, 2009 at 8:47 am |
Im so naive! I didn’t believe you at first, not until I looked at the image in close up. Clever effect
July 8, 2009 at 8:54 am |
Hello,
I had a look in MS Paint and I was well impressed
I think docpi may have a point about jpg/png as there was some distortion in the colours, otherwise I thought it was a great start to the day.
Carmen
July 8, 2009 at 9:02 am |
Splendid idea! Would be great to see it without compression artefacts.
July 8, 2009 at 9:20 am |
Very cool. I’d love to see a high-res version.
July 8, 2009 at 9:23 am |
Would it be more effective if you broke the continuity of the green by changing which lines are that colour? So purple turns into green, and green turns into orange on going from sea to land?
As it is the illusion really isn’t working for me, I’m afraid to say.
July 8, 2009 at 9:28 am |
That is such a cool effect. I just knocked one up in MS Paint of my name in a couple of minutes.
July 8, 2009 at 9:50 am |
where did the UK go?
July 8, 2009 at 9:50 am |
The ringing on the edges of the continents is not a compression artefact, it is a 1 pixel stroke around the country borders. Check out the white lines inside Europe.
July 8, 2009 at 10:19 am |
Richard
I just made a couple of Photoshop Patterns to make this effect really easily. It’s cool when you adjust the Hue on the end result.
Have a look at these, they took literally seconds to make.
http://tonicblue.co.uk/blog/?attachment_id=34
http://tonicblue.co.uk/blog/?attachment_id=35
You will need to click on the full size version to see them properly. Each line is just one pixel. I think it improves the effect. I have a head ache now after making them though.
July 8, 2009 at 10:57 am |
2 illusions in one !
I found that if you star at the picture close up, blur your eyes, thrn move your head slowly away from the screen, the bars disappear leaving you with a clear image of the map.
Oh, and yeah the colorings good but i feel its a bit too similer to start with so you dont get as much of the ‘wow’ factor…… maybe compression to blame?……..
July 8, 2009 at 11:30 am |
Yes. We don’t see colors, but a small radius of colors as a color. All the background is light green, but the purple line on sea make it feels like cyan and the yellow line contrast with purple line strengthening green.
July 8, 2009 at 11:32 am |
A bigger image will be really good!
July 8, 2009 at 11:58 am |
“The ‘green’ of the land is the same colour as the ‘blue’ of the sea.”
No. The land is orange and the sea is purple.
I don’t get it.
July 8, 2009 at 12:32 pm |
Yes I understand how the image was made, but this has no impact on analysis, the focus is on why we see it different.
July 8, 2009 at 1:18 pm |
I can’t acclaim this highly enough. The original illusion was good but the added psychological twist really adds a kicker. People are so familiar with the world map image, so when they’re told of the colour difference it’s even more amazing. GREAT IDEA Richard.
July 8, 2009 at 1:21 pm |
I’m going to make a large, PNG (and SVG) version of this if you don’t mind (I’ll post it here)
July 8, 2009 at 1:37 pm |
http://tonicblue.co.uk/blog/?attachment_id=37
I made a high resolution version. I hope you don’t mind. I just had nothing to do at lunch and wanted to play with the filters I made
July 8, 2009 at 2:33 pm |
Apart from needing to get a .gif or .png version (jpg messes the colours slightly) it’s a fab variation on the original!
July 8, 2009 at 3:07 pm |
Here’s my large (4312×2128) HQ version in PNG which truely only uses 3 colours (rather than the anti aliased JPG) http://bit.ly/FiqDe
July 8, 2009 at 3:21 pm |
JPG does add compression artifacts, which could be avoided by using a 24-bit PNG in this case.
FYI if you want to look at this image close up, in Firefox, just hold CTRL and use the mousewheel to zoom in, or hold CTRL and press “+” a bunch of times. CTRL 0 resets zoom to normal.
July 8, 2009 at 3:38 pm |
My impression is that New Zealand doesn’t exist in this particular world.
July 8, 2009 at 3:48 pm |
[...] started making his own one of a world map which you can see here which is pretty impressive. I decided to make a few of my own including a higher resolution version [...]
July 8, 2009 at 5:00 pm |
Why thank you very much Richard
A guy from Scientific American just tweeted me and asked if it could go up on the SA Gallery. Quite a good day so far I would say
July 8, 2009 at 5:14 pm |
I improved the colours on my 4312×2128 PNG of the “Wiseman’s World” illusion. http://bit.ly/rB0mC
July 8, 2009 at 5:32 pm |
I don’t get it really – if the land and the sea are the same colour, then why when I convert to greyscale do they still look separate?
July 8, 2009 at 5:39 pm |
I worry that we might be drifting away from true contrast illusions here.
The illusion is that specifically the turquoise stripes should look blue in some places and green in others. I think what we might be looking at in some of these is simply the fact that the average of turquoise and orange (land) is green and the average of turquoise and magenta (sea) is blue.
In the map image I have difficulty focussing specifically on the blurred turquoise stripes. In the butterfly image they’re just too small to resolve. Certainly the resampled version shown on this page is simply blurring the image and showing you the true average colours, and I suspect that if the full-size version linked from tonicblue’s page looks any different then that means your monitor gamma is set incorrectly.
July 9, 2009 at 11:10 am
I think you might be trying to make a distinction where there isn’t one. As far as I’m concerned the fact that the average of the two colours is the same is how the illusion works. It’s just the fact that you can make the bars quite large and still retain the effect. That’s quite cool. But versions with bars that are too small to resolve are cool also. As far as I know however, they’re working on the same effect.
PS. Disregard the resized tonicblue version in the post, it does not have correct colours, the blue and green are actually different colours.
July 9, 2009 at 11:56 am
I’m pretty sure there is a distinction. The original illusion works by finding a colour that looks blue when seen against magenta and looks green when seen against orange, and presenting it in an intricate picture designed so you don’t consciously notice the background changing. You’d swear blind there were four colours in the image: blue, green, orange and purple. I think the version of the map someone posted with the magenta/orange border really helped with this.
Printing three colours very small so it blurs into two is just dithering. You look at them and see two differently coloured regions and are vaguely aware of a load of high-frequency stripes you can’t really resolve, just like when you look at a printed photograph in a newspaper. You wouldn’t like to say either way whether the blue stripes in one region are the same as the blue stripes in another because you’d be only fairly sure that any of the stripes were blue at all.
(PS. I do find it amusing that when you shrink these the stripes combine so they become really unimpressive attempts at themselves.)
July 9, 2009 at 12:10 pm
I take your point. The question is, is the effect played upon by dithering or colour merging in the high frequency versions the same physiological effect as achieved by finding a colour that appears different based on that what colour surrounds it. Although I cannot say for certain I think these effects are the same.
July 9, 2009 at 12:16 pm
I don’t think dithering uses a psychological effect. After all, dithering works even when the image is sufficiently blurred/far away that you can’t see the individual dots/stripes. It’s just that the reflected light from each area mixes to produce one colour.
July 9, 2009 at 12:18 pm
Psychological effects and physiological effects are different things
What you describe is indeed physiological (as I said). Both illusions work at any suitably distant distance anyway.
July 9, 2009 at 12:22 pm
Oh, no, I just misread that!
July 9, 2009 at 12:24 pm
Hang on, no, the contrast illusion doesn’t work at a distance where you can’t resolve the turquoise stripes. How can you say two stripes are different colours when they’re invisible?
July 9, 2009 at 12:26 pm
OK it doesn’t work from a distance where you can no longer resolve it because then you can’t see it! This is all beside the point.
July 8, 2009 at 5:53 pm |
Ok, ok, don’t get carried away now. We’ve known this effect for ages. It’s used in TV screens from CRT to LCD. It’s amazing how people look at it every day and don’t even notice.
Perhaps the only interesing aspect of this would be to explore how fat the lines can get until the effect disappears. Where is the boundary of this?
July 8, 2009 at 5:58 pm
David,
You’ve misunderstood the point. The intention here is to create an illusion more akin to this one but for colours rather than greys. Like I said, though, I think you’re right about what effect some of these are actually exploiting.
July 8, 2009 at 9:01 pm |
[...] 8, 2009 by Jackybird Richard Wiseman put up a nice color illusion on his blog not long ago. Yesterday, he posted a varition. I decided to give it a go [...]
July 8, 2009 at 11:36 pm |
Tried it adding a border to see if it helped with the contrast, I think you lose the fidelity of the map though.
http://i4.photobucket.com/albums/y123/j_robbins/JasWorldMap2.png
July 9, 2009 at 1:20 am |
[...] New illusion: Work in progress This week the blog is turning into a bit of an illusion fest. Last week I posted a wonderful contrast illusion. I [...] [...]
July 9, 2009 at 2:57 am |
Just to point out that if you are not seeing the illusion, you many not be alone. I’ve been trying to figure out why everyone is so amazed at these illusions for a week – it seems that due to my inability to distinguish various shades of greens, blues, pinks etc I don’t see any colour change. The two stripes are always the same colour.
One of the few examples of how having a (minor) disability enables you to see thing clearer. Sort of.
July 9, 2009 at 2:59 am |
Meant to say above, “if you are not seeing the illusion and suffer from colour blindness, you may not be alone.”
July 9, 2009 at 7:44 am |
All I see is pink green and blue on the top one and green and blue on the bottom no matter how I look at them.
Not colour blind.
July 9, 2009 at 9:23 am |
Loving the illusions, keep them coming.
Saw this one on youtube, and thought of your site for some reason
Optical Illusion Girlfriend…
http://www.youtube.com/v/a91eiu_eer4
Cheers
P.S. Love the vanishing head illusion
July 9, 2009 at 11:19 am |
I loved the original illusion, it gave me a really strong sense of being deceived and many of the people I showed it to didn’t believe that the ‘green’ and the ‘blue’ were actually the same colour.
These other versions are a lot less impressive to me.
Don’t all colour magazine and newsprint printers use a very similar technique?
Cyan, Magenta, Yellow and Black, four colours, are all you need to create a photo-realistic image. The colours aren’t mixed they’re just small dots placed near each other and taking advantage of this effect.
July 9, 2009 at 12:14 pm |
I’ve created two smaller versions of the picture in GIF format:
This really small version shows better the intended effect of the illusion:
July 9, 2009 at 12:16 pm |
Something went wrong on my previous comment!
Here is the missing links to the images:
http://rs561tl2.rapidshare.com/files/253751745/wisemansworld.gif
http://rs735tl.rapidshare.com/files/253751833/wisemansworld1.gif
October 5, 2009 at 11:48 pm |
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