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Tag Archives: droste

A few weeks back, Yuv posted a how-to on MathMap, a Gimp plugin that allows distortion of images specified in a simple programming language. Yuv’s instruction on compiling from source work fine but you can also grab .deb and .rpm binaries from the MathMap homepage. What made me want to try MathMap was this image I found on FlickR, generated using the Pierce Quincuncial projection – a conformal map projection that presents a sphere as a square. It also has the mind bending recursive Droste effect for maximum weirdness. If you want to play with this projection, copy and paste the script from here. I used fpsurgeon’s version, though I had to comment out two lines at the end to get it to wrap properly (starting imagex= and imagey=).

To get started, load up an equirectangular panorama (aspect ratio must be 2:1) then go to Filters -> Generic -> MathMap and paste in the Quincuncial script. By setting imageH to 1, adjusting the number of tiles and equator level, I quickly came up with this (click for a bigger version).

oak_tree_mm_800x400_85

This one works quite well with multiple tiles as they seem to be interconnected by the Millennium bridge.

under_bridge_mm_800x400_85

Click ‘Drostify’ to apply the Escher-esque effect to the tiles. ‘DrosteP1’ is the number of  strands spiraling in, and ‘DrosteP2’ is the number of repetitions of the basic element per cycle. The effect of the Quincuncial projection is lost a little in this image of Brighton Pier but the Droste effect is fairly insane.

brighton_mm_800x400_85

And by playing around with some of the other options you can really go to town. These effects are all so abstract that the problem is knowing when to stop tweaking – it really is quite addictive. Here’s St. Paul’s Cathedral disappearing into a vortex.

st_paul_mm_800x400_85

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