Spiral Image: Makes a spiraling Fibonacci image!

Local image file for use in Spiral Image:
Height/width of the cropped square section:

Note: it's best if you choose an even number divisible by three)

(maximum of 900)
Spiral rotation angle (90 or -90): 90 -90
Rotate final image -- squat or tall? squat tall
Rotate original image by angle (90 180 270) degrees: 0 90 180 270
Special effects:
Crop from x position (choose 0 if from upper left):
Crop from y position (choose 0 if from upper left):

Developed by
Andy Long
Northern Kentucky University

How does this program work?

It's based on using a square part of an image, and appending rotated versions successively to construct finer and finer approximations to the Golden rectangle.

If you save the sample image above to your local machine, browse to it to load it, and use 610 as the width, with Rotate original image by 270, then you'll recreate the sample image (the hard way!). Then you can compare and contrast the results using different angles, the special effects, etc.

powered-by-cgi.tcl logo Report problems with this script to Andy Long.
cgi.tcl script creator: Don Libes, of NIST.
cgi.tcl script butcher: Andy Long, of NKU.