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change hex color to ligher or darker

Posted on 2004-10-11
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Medium Priority
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Last Modified: 2010-05-18
I need some kind of function that can i change a hex color to lighter or darker.

Example:
------------------------

strColor = LightenColor("#000000", 50)
strColor2 = LightenColor("#FFFFFF", 25)

Function LightenColor(strHex, strValue)
      'strHex holds the color
      'strValue holds how much to change
      'Code to lighten color
End Function

Function DarkenColor(strHex, strValue)
      'strHex holds the color
      'strValue holds how much to change
      'Code to lighten color
End Function
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Thanks in advanced.
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Question by:MadDog986
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2 Comments
 
LVL 14

Accepted Solution

by:
dfu23 earned 750 total points
ID: 12280930
Something along these lines ... intPercentage can be a positive number to lighten and negative to darken:

Function LightenDarken(intR, intG, intB, intPercent)
    Dim r : r = Int((intR * intPercent) / 100)
    Dim g : g = Int((intG * intPercent) / 100)
    Dim b : b = Int((intB * intPercent) / 100)
    If r > 255 Then r = 255
    If g > 255 Then g = 255
    If b > 255 Then b = 255
    If r < 0 Then r = 0
    If g < 0 Then g = 0
    If b < 0 Then b = 0
    r = Hex(r)
    g = Hex(g)
    b = Hex(b)
    If Len(r) = 1 Then r = "0" + r
    If Len(g) = 1 Then g = "0" + g
    If Len(b) = 1 Then b = "0" + b
    LightenDarken = r + g + b
End Function
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Author Comment

by:MadDog986
ID: 12295439
thanks, had to edit it a bit but that works.
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