Software Venture Consulting

FileMaker Pro downloads & Resources
FileMaker Custom Functions
FileMaker Web Viewer Examples
FileMaker Pro & Lasso Consulting
FileMaker Books
FileMaker Articles
FileMaker Error Reference

Free Web Tools
Free FileMaker Tools

Personal Pages

Shopping Cart
Shopping Cart


Free Newsletter


Privacy Policy

FileMaker is a registered trademark of FileMaker, Inc. in the U.S. and other countries.


 FileMaker Pro Custom Functions

List  |  Show Random  |  Upload  |  Add This to Your Site

RGBtoHSB ( redPercentage ; greenPercentage ; bluePercentage )

Rate this function:  

  Average rating: 4.2  (33 votes)
  Discuss this Custom Function

Joe Rovang,

Converts color from RGB percentages to HSB/HSV values.

Sample Input:
RGBtoHSB ( 0 ; 0 ; .5 )
Sample Output:

 Then copy & paste into FileMaker Advanced's Edit Custom Function window.



This function converts the specified color RGB percentages to hue, saturation, and brightness (HSB/HSV) values. (Note that HSB/HSV is not the same as HSL!)

Note that all values except hue are in decimals between 0 and 1, inclusively. RGB values on the 0-255 scale must be divided by 255 before using them in this function.

The math behind this function was inspired by formulas listed on Wikipedia.

Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it


Hi Joe, Entered your RGBtoHSB function into FM11 Advanced with no problem, but results are bizzare. Entered 239, 200, 16 as RGB numbers, divided all three by 255, passed parameters to function, answer:

Can I contact you directly for help. Be glad to pay. Have almost 5000 threads with only RGB numbers that I need to convert. Thx.
PS: My second custom function, so new at this process.

Guy Foster, Fort Lauderdale, FL
January 28, 2012 3:09am

Make a comment about this Custom Function (please try to keep it brief & to the point). Anyone can post:

Your Name:
characters left. If you paste in more than 1500 characters, it will be truncated. Discuss the function - advertisements and other useless posts will be deleted.
Answer 3 + 2 =
Search for Custom Functions:

Custom Functions Widget
Download the Custom Function Dashboard Widget for OS X
Keep all the latest Custom Functions right at your fingertips!

Newest Custom Functions:

1. HexUUIDToNum_cf (_uuid)
  (Sat, Jun 16, 1:55pm)
2. httpResponseCode ( responseHeaders )
  (Tue, Jun 12, 10:40pm)
3. FindDuplicateCharacters ( string )
  (Fri, Jun 08, 5:01pm)
4. FieldRepetitionLast ( field ; maxRepetition )
  (Wed, Jun 06, 6:05pm)
5. CountModifiedRecords ( NameTimestampField ; StartTimestamp ; EndTimestamp )
  (Mon, May 28, 8:23am)
6. JSONArrayLength ( JSONArrayStr )
  (Fri, May 25, 7:46am)
7. interpolation (y1; y2; y3; x1; x2; x3; x1y1; x2y1; x1y2; x2y2; rnd)
  (Sat, May 19, 3:55am)
8. @JSONFormatElements ( json )
  (Tue, May 15, 3:31am)

RSS Feed of Custom Functions