''' <summary>
''' Creates a composite color transform from specified source and destination RGB profiles
''' and returns optimized thread-unsafe color transform.
''' </summary>
Public Shared Function GetOptimizedRgbTransform(sourceRgbProfileFilename As String, destRgbProfileFilename As String) As Vintasoft.Imaging.ColorManagement.ColorTransform
    ' create ICC profiles
    Using sourceIccProfile As New Vintasoft.Imaging.ColorManagement.Icc.IccProfile(sourceRgbProfileFilename)
        Using destIccProfile As New Vintasoft.Imaging.ColorManagement.Icc.IccProfile(destRgbProfileFilename)
            ' check device color space of the source profile
            If sourceIccProfile.DeviceColorSpace <> Vintasoft.Imaging.ColorSpaceType.sRGB Then
                Throw New System.ArgumentException("Source profile is not RGB profile.")
            End If
            ' check device color space of the destination profile
            If destIccProfile.DeviceColorSpace <> Vintasoft.Imaging.ColorSpaceType.sRGB Then
                Throw New System.ArgumentException("Destination profile is not RGB profile.")
            End If

            ' get transforms from device color space to PCS
            Dim deviceToPcsTransform As Vintasoft.Imaging.ColorManagement.ColorTransform = sourceIccProfile.GetDeviceToPcsTransform()
            ' get transforms from PCS to device color space
            Dim pcsToDeviceTransform As Vintasoft.Imaging.ColorManagement.ColorTransform = destIccProfile.GetPcsToDeviceTransform()
            ' composite color transform
            Dim composition As Vintasoft.Imaging.ColorManagement.ColorTransform
            If sourceIccProfile.PcsColorSpace = destIccProfile.PcsColorSpace Then
                ' create simple composite color transform
                composition = Vintasoft.Imaging.ColorManagement.SimpleCompositeColorTransform.Create(deviceToPcsTransform, pcsToDeviceTransform)
            Else
                If sourceIccProfile.PcsColorSpace = Vintasoft.Imaging.ColorSpaceType.PCSXYZ Then
                    ' create simple composite color transform with intermediate PCSXYZ->PCSLab conversion
                    composition = Vintasoft.Imaging.ColorManagement.SimpleCompositeColorTransform.Create(deviceToPcsTransform, Vintasoft.Imaging.ColorManagement.ColorTransforms.PcsXyzToPcsLabD50, pcsToDeviceTransform)
                Else
                    ' create simple composite color transform with intermediate PCSLab->PCSXYZ conversion
                    composition = Vintasoft.Imaging.ColorManagement.SimpleCompositeColorTransform.Create(deviceToPcsTransform, Vintasoft.Imaging.ColorManagement.ColorTransforms.PcsLabToPcsXyzD50, pcsToDeviceTransform)
                End If
            End If
            ' return optimized color transform
            Return Vintasoft.Imaging.ColorManagement.ColorTransformsOptimizer.GetOptimizedTransform(composition, False)
        End Using
    End Using
End Function

/// <summary>
/// Creates a composite color transform from specified source and destination RGB profiles
/// and returns optimized thread-unsafe color transform.
/// </summary>
public static Vintasoft.Imaging.ColorManagement.ColorTransform GetOptimizedRgbTransform(
    string sourceRgbProfileFilename, string destRgbProfileFilename)
{
    // create ICC profiles
    using (Vintasoft.Imaging.ColorManagement.Icc.IccProfile sourceIccProfile =
        new Vintasoft.Imaging.ColorManagement.Icc.IccProfile(sourceRgbProfileFilename))
    using (Vintasoft.Imaging.ColorManagement.Icc.IccProfile destIccProfile =
        new Vintasoft.Imaging.ColorManagement.Icc.IccProfile(destRgbProfileFilename))
    {
        // check device color space of the source profile
        if (sourceIccProfile.DeviceColorSpace != Vintasoft.Imaging.ColorSpaceType.sRGB)
        {
            throw new System.ArgumentException("Source profile is not RGB profile.");
        }
        // check device color space of the destination profile
        if (destIccProfile.DeviceColorSpace != Vintasoft.Imaging.ColorSpaceType.sRGB)
        {
            throw new System.ArgumentException("Destination profile is not RGB profile.");
        }

        // get transforms from device color space to PCS
        Vintasoft.Imaging.ColorManagement.ColorTransform deviceToPcsTransform = sourceIccProfile.GetDeviceToPcsTransform();
        // get transforms from PCS to device color space
        Vintasoft.Imaging.ColorManagement.ColorTransform pcsToDeviceTransform = destIccProfile.GetPcsToDeviceTransform();
        // composite color transform
        Vintasoft.Imaging.ColorManagement.ColorTransform composition;
        if (sourceIccProfile.PcsColorSpace == destIccProfile.PcsColorSpace)
        {
            // create simple composite color transform
            composition = Vintasoft.Imaging.ColorManagement.SimpleCompositeColorTransform.Create(
                deviceToPcsTransform,
                pcsToDeviceTransform);
        }
        else
        {
            if (sourceIccProfile.PcsColorSpace == Vintasoft.Imaging.ColorSpaceType.PCSXYZ)
            {
                // create simple composite color transform with intermediate PCSXYZ->PCSLab conversion
                composition = Vintasoft.Imaging.ColorManagement.SimpleCompositeColorTransform.Create(
                    deviceToPcsTransform,
                    Vintasoft.Imaging.ColorManagement.ColorTransforms.PcsXyzToPcsLabD50,
                    pcsToDeviceTransform);
            }
            else
            {
                // create simple composite color transform with intermediate PCSLab->PCSXYZ conversion
                composition = Vintasoft.Imaging.ColorManagement.SimpleCompositeColorTransform.Create(
                    deviceToPcsTransform,
                    Vintasoft.Imaging.ColorManagement.ColorTransforms.PcsLabToPcsXyzD50,
                    pcsToDeviceTransform);
            }
        }
        // return optimized color transform
        return Vintasoft.Imaging.ColorManagement.ColorTransformsOptimizer.GetOptimizedTransform(composition, false);
    }
}