一、两个三维坐标的距离

r3 =( r1 - r2) / 256
g3 = (g1 - g2) / 256
b3 = (b1 - b2) / 256

成都创新互联从2013年成立，先为金堂县等服务建站，金堂县等地企业，进行企业商务咨询服务。为金堂县企业网站制作PC+手机+微官网三网同步一站式服务解决您的所有建站问题。

diff = sqrt(r3 r3 + g3 g3 + b3 * b3)
值越大，相似度越小；值越小，相似度越大！也可以把上面用1减去，保持值和相似度一致

百分比就是上面得到的值除以那个值的极限大值。sqrt(r3 r3 + g3 g3 + b3 b3)/sqrt(255255+255255+255255)

二、VB参考代码

Private Function Minimum(ParamArray Vals())
Dim n As Integer, MinVal
On Error Resume Next
    MinVal = Vals(0)
    For n = 1 To UBound(Vals)
        If Vals(n) < MinVal Then MinVal = Vals(n)
    Next n
    Minimum = MinVal
End Function
Private Function Maximum(ParamArray Vals())
Dim n As Integer, MaxVal
On Error Resume Next
    MaxVal = Vals(0)
    For n = 1 To UBound(Vals)
        If Vals(n) > MaxVal Then MaxVal = Vals(n)
    Next n
    Maximum = MaxVal
End Function

Private Sub c2hsb(ByVal clr As Long)
Dim MyR As Single, MyG As Single, MyB As Single
Dim Max As Single, Min As Single
Dim MyS As Single
Dim Delta As Single, MyVal As Single
Dim cc As String * 6
Dim r1, g1, b1 As Byte
On Error Resume Next
    cc = Right("000000" + Hex$(clr), 6)
    b1 = Val("&H" + Left(cc, 2))
    g1 = Val("&H" + Mid(cc, 3, 2))
    r1 = Val("&H" + Right(cc, 2))
    MyR = r1 / 255: MyG = g1 / 255: MyB = b1 / 255
    Max = Maximum(MyR, MyG, MyB)
    Min = Minimum(MyR, MyG, MyB)
    hsbB = Int(Max * 100)
    If Max <> 0 Then
        MyS = (Max - Min) / Max * 100
    Else
        MyS = 0
    End If
    hsbS = MyS
    If hsbS = 0 Then
        hsbH = 0
    Else
        Delta = Max - Min
        Select Case Max
        Case MyR
            MyVal = (MyG - MyB) / Delta
        Case MyG
            MyVal = 2 + (MyB - MyR) / Delta
        Case MyB
            MyVal = 4 + (MyR - MyG) / Delta
        End Select
        MyVal = MyVal * 60
        If MyVal < 0 Then MyVal = MyVal + 360
        hsbH = MyVal
    End If
'   Debug.Print "hsb="; hsbH; " "; hsbS; " "; hsbB
End Sub

Private Function ColorDistance(ByVal c1 As Long, ByVal c2 As Long) As Long
Dim cd As Long
Dim h2, s1, b1, h3, s2, b2 As Single
On Error Resume Next
    If c1 = -1 Or c2 = -1 Then
        ColorDistance = 1000000
        Exit Function
    End If
    c2hsb (c1)
    h2 = hsbH / 360
    s1 = hsbS
    b1 = hsbB
    c2hsb (c2)
    h3 = hsbH / 360
    s2 = hsbS
    b2 = hsbB
    cd = Abs(h2 - h3)
    cd = cd + Abs(s1 - s2)
    cd = cd + Abs(b1 - b2)
    ColorDistance = cd
End Function

另外有需要云服务器可以了解下创新互联cdcxhl.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。

名称栏目：比较两个RGB颜色的相似度-创新互联
分享链接：http://kswjz.com/article/cdiigp.html