Prism Circle application demonstrates a custom menu I created for quick, easy, and informed color selection on the Macintosh. In functionality, it resembles Apple's Color Picker dialog box; you can select a color from thousands of colors using Prism Circle.
Press the Option key, or drag across the eye dropper, to toggle desktop color selection on and off. When on, you can select a color from anywhere on the desktop, not just from the menu. You can use Prism Circle in this mode to get the red, green, and blue color values for any pixel on any of your screens — particularly useful if you are color blind like me and can't tell purple from blue!
Press the Command key to select a gradient ("value") of the current color.
Press the Shift key to constrain color selection to varying saturations of the current color.
Press the Control key to constrain color selection to varying hues of the current color.
Prism Circle application is freeware and may be freely copied and distributed, but must not be altered in any way. It may not be sold for profit. It is not public domain software; I retain the copyright.
Prism Circle MDEF, the menu definition procedure code which calculates, displays, and manages the Prism Circle color selection menu, is a commercial product and programmers can license it from me.
There is a one-time licensing fee of $30 in U.S.A. currency to a single, independent developer for unlimited use in all projects. Multiple-developer firms pay $30 in U.S.A. currency for each different commercially released product using Prism Circle MDEF. I accept U.S.A. checks, cash, money orders, or C.O.D. orders (in the continental U.S.). Add $10 shipping and handling fee for each order shipped.
Interested programmers can contact me at:
Dean A. Snyder
Zora Enterprises
9427 S. Richmond
Evergreen Park, Illinois 60642
708 422-7317
America Online: DeanSnyder
CompuServe: 76527,641
AppleLink: Snyder.Dean
GEnie: D.SNYDER4
In general, at this point in time, I cannot provide technical support for the Prism Circle MDEF, other than the documentation provided to licensees.
Although I have programmed Prism Circle application and Prism Circle MDEF in all good faith, neither I nor anyone else will be held liable for real or alleged damages associated with it. The Prism Circle MDEF is sold as is.
I have tested Prism Circle on a Mac II, Mac II si, and Mac Quadra 900 (with cache on).
Much thanks goes to Robert A. Mintzer, Chicago Macintosh guru, for the many selfless hours spent helping me learn Macintosh programming, and, in particular, for several great suggestions regarding Prism Circle itself.
Also to Dave Schulz and Geordie Korper at University Computers, Chicago, for indulging my penchant for repeated testing on their various Macintoshes.
 
My work is made possible by my father who showed me the path, my mother who started me on it, and my wife who is travelling it with me.