illusion meme

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Uploader shuugo, avatar
Tags illusion meme
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shuugo: Another thing that imagemagick does not show :(
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artanis: yeah, ok...
is there a name for this method of imagery, so that I may search google for it?
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shuugo: no idea but I would also like to know
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shuugo: in the mac os x happens too btw
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artanis: All I can figure is that it's an artifact of the library used to make the thumb. When you save the thumb, you get the primary image, when you save the full, you get the hidden image.
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artanis: Forget the above, please. It can't possibly be right.
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Anonymous1: You could simply just call it "hax"
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Anonymous2: When I click on the thumbnail the image that comes up has vertical and horizontal lines all over it and a line that says "scaled to fit the screen; click to enlarge". When I click on that instead of enlarging the picture gets smaller and clearer. Which makes me wonder - if an image is reduced to thumbnail size by selecting, say, every 50th pixel horizontaly and verticaly as a sample then you can hide a second picture within a larger picture by inserting the second picture's pixels in place of the main picture's every 50th pixel. That way the thumbnail selection process would pull out the second picture's pixels, but on the main picture, depending on the sizing, either the second picture's pixels would be omitted to scale the image down, or at full size the second image would interfere with the main picture possibly causing stripes as in this image?
Signed: Father of the Shish
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artanis: That's what I was thinking. Except I can't find the second image's pixels anywhere.
And it doesn't explain why when I DL and open the image in Fireworks, it shows the thumb image (at full size.) I had to use print-screen to get a copy of the image shown above.
The grid lines are all just black. When you DL it, you get the thumb image with white pixels where the grid lines are not in this image.
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Anonymous3: I'm wondering if it's something to do with the PNG image format, and different programs reading it in different ways...
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artanis: Another possibility would be that the png has layers or frames in it (which macromedia fireworks isn't showing at all, though,) and the image-manip programs end up using one layer (the thumb image,) and the browsers another (the hidden image.)
But that doesn't explain the grid/white pixel thing, because layers would not require that.

I'm going to start posting inquiries at a few tech boards.
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shuugo: let us know if you find something
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Anonymous4: I know (from personal experience) that when you load an animated .gif into The GIMP it'll show the various frames of the animation as individual layers (I still use version 1.2.4). You might try that to see if the preview image is one of them.

Incidentally, if the .png supports the functionality of .gifs, then what artanis suggested could concievably work. You setup the preview as the first image in an animation, and have the animation keep looping back to the second image without revisiting the first.
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Anonymous5: Never mind, it looks like no such layers are present ;|
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leacheate_soup: http://www.4p8.com/eric.brasseur/gamma.html