CODEWITHSUNDEEP
asp.net.netvb.netcolors
Greg
Greg

Reputation: 8784

Determine Closest Known Color

I allow users of my app to select custom colors and want a way to display a friendly name for each color instead of displaying a text representation of the hex code.

How do I find the closest System.Drawing.Color for a given hex code?

Upvotes: 4

Views: 651

Answers (1)

Greg
Greg

Reputation: 8784

Hope this helps somebody...

Public Function GetClosestColor(hex_code As String) As Color
    Dim c As Color = ColorTranslator.FromHtml(hex_code)
    Dim closest_distance As Double = Double.MaxValue
    Dim closest As Color = Color.White

    For Each kc In [Enum].GetValues(GetType(KnownColor)).Cast(Of KnownColor).Select(Function(x) Color.FromKnownColor(x))
        'Calculate Euclidean Distance
        Dim r_dist_sqrd As Double = Math.Pow(CDbl(c.R) - CDbl(kc.R), 2)
        Dim g_dist_sqrd As Double = Math.Pow(CDbl(c.G) - CDbl(kc.G), 2)
        Dim b_dist_sqrd As Double = Math.Pow(CDbl(c.B) - CDbl(kc.B), 2)
        Dim d As Double = Math.Sqrt(r_dist_sqrd + g_dist_sqrd + b_dist_sqrd)

        If d < closest_distance Then
            closest_distance = d
            closest = kc
        End If
    Next

    Return closest
End Function

Upvotes: 5

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