"lightening" a color

[J. Landman Gay]

On 9/10/16 5:00 PM, Dr. Hawkins wrote:
> Is there a way to "lighten" a color.

This showed up on the list some time ago:

function lightenColor origColor
   try
     repeat with i = 1 to 3
       add 50 to item i of origColor
       if item i of origColor > 255 then put 255 into item i of origColor
       if item i of origColor < 0 then put 0 into item i of origColor
     end repeat
     return origColor
   catch tSomeErr
     return origColor
   end try
end lightenColor

I also made this note from StackOverflow, which I haven't quite wrapped 
my head around yet:

For combining 2 colours using RGB values, there are 2 ways.

     If you need a lighter texture, the formulae you need to use is (r1, 
g1, b1) + (r2, g2, b2) = (min(r1+r2, 255), min(g1+g2, 255), min(b1+b2, 255))

     If you need a slightly darker texture , use (r1, g1, b1) + (r2, g2, 
b2) = ((r1 + r2) / 2, (g1 + g2) / 2, (b1 + b2) / 2)


-- 
Jacqueline Landman Gay         |     jacque at hyperactivesw.com
HyperActive Software           |     http://www.hyperactivesw.com