Talk:Visual cryptography: Difference between revisions

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I moved the following from the page. It's a good idea, but the implementation is flawed — one of the shares shows the image. — Matt Crypto 08:36, 30 November 2005 (UTC)[reply]

Yes, I did a mistake. The second image was also intended to be black&white whereas it contained some additional colours that gave it away. I changed it to monochrome and now I hope it's ok, but it's still better if you check it :). Thanks for the notice. Random user name 20:12, 12 December 2005 (UTC)[reply]

The images look OK to me now. So I moved them back to the article. It seems terribly complicated, though, in order to communicate a well-known logo. Would a much lower-resolution image that encoded a short bit of text be worthwhile? Perhaps something about the squeamish ossifrage or something else from the list of famous ciphertexts? --DavidCary 16:31, 23 December 2005 (UTC)[reply]

I don't quite understand the use of 'complicated' here. Is the problem with the size of the image or the wording of the description? Random user name 02:44, 31 December 2005 (UTC)[reply]

Fascinating idea, but I don't have Matlab. Any way of showing what the result is supposed to be without Matlab? — Preceding unsigned comment added by Mcswell (talk • contribs) 15:51, 5 April 2006 (UTC)[reply]

It is also possible to take one image and overlay it on top of the other in Photoshop or The GIMP with ~50% transparency. Also, the matlab code given doesn't work in the latest matlab (2006b, I don't know if the behavior in question changed since previous versions) because the image 1 is in 8 bit RGB and image 2 is in 16-color indexed grayscale. Matlab thus gives a 3 dimensional array with white = 0 black = 255 for image 1 and a 2 dimensional array with white = 0 black = 15 for image 2. I imagine it'd be easier to fix the images rather than add the necessary code to manipulate the images in matlab to the desired form. Drooling Sheep 10:32, 14 January 2007 (UTC)[reply]

Is this worth adding to the article?

Doug Stinson's Visual Cryptography Page — Preceding unsigned comment added by DavidCary (talk • contribs) 22:42, 23 December 2005 (UTC)[reply]

@@ Line 14: / Line 14: @@
 Fascinating idea, but I don't have Matlab.  Any way of showing what the result is supposed to be without Matlab? {{unsigned|Mcswell|15:51, 5 April 2006 (UTC)}}
+*It is also possible to take one image and overlay it on top of the other in Photoshop or The GIMP with ~50% transparency.  Also, the matlab code given doesn't work in the latest matlab (2006b, I don't know if the behavior in question changed since previous versions) because the image 1 is in 8 bit RGB and image 2 is in 16-color indexed grayscale.  Matlab thus gives a 3 dimensional array with white = 0 black = 255 for image 1 and a 2 dimensional array with white = 0 black = 15 for image 2.  I imagine it'd be easier to fix the images rather than add the necessary code to manipulate the images in matlab to the desired form.  [[User:Drooling Sheep|Drooling Sheep]] 10:32, 14 January 2007 (UTC)
 Is this worth adding to the article?