Calculating harmonised colours

[Eric Chatonet]

Hi all,

I would like to build a range of harmonised colours in the same tint:
Something like  "162,173,215","182,193,235","202,213,255", etc.
As long than a colour value is less than 255, it does not seem to be  
a problem as above.
But I don't find out how to calculate consistent values once a value  
has reached 255.
Any ideas?

Best Regards from Paris,
Eric Chatonet
------------------------------------------------------------------------ 
----------------------
http://www.sosmartsoftware.com/    eric.chatonet at sosmartsoftware.com/