poIImagePlane SetColorAlphaTarget

To create one image plane, and then use the color alpha filter to remove all "white" from the image (making those areas of the image transparent). The image plane without the filter is show in Figure 1 (below), while the image plane with the filter active is shown in Figure 2 (below):

hwi OpenStack
if {[catch {
    hwi GetActiveClientHandle client_handle
    hwi GetSessionHandle session_handle
    client_handle GetImagePlaneCtrlHandle ipc_handle
    set ipid1 [ipc_handle AddImagePlane Logo1]
    ipc_handle GetImagePlaneHandle imageplane_handle $ipid1
    imageplane_handle SetFileName g:/samples2/VideoOverlay/Altair_logo.jpg
    imageplane_handle SetMode background
    imageplane_handle SetCrop 0 0 0.9995 0.995
    imageplane_handle SetFilterType ColorAlpha;
    imageplane_handle SetFilterMode equal;
    imageplane_handle SetColorAlphaTarget "255 255 255"
    imageplane_handle SetColorAlphaTolerance 18
    imageplane_handle SetMipMapMode Linear1
    puts "  Filter Type: [imageplane_handle GetFilterType]";
    puts "  Filter Mode: [imageplane_handle GetFilterMode]";
    puts "  Alpha Color Target: [imageplane_handle GetColorAlphaTarget]";
    puts "  Alpha Color Tolerance: [imageplane_handle GetColorAlphaTolerance]";
    puts "  MipMap Mode: [imageplane_handle GetMipMapMode]";
    client_handle Draw
} result]} {
    global errorInfo;
    puts stderr $result;
    puts "[session_handle GetError]";
    puts stderr "*** Tcl TRACE ***";
    puts stderr $errorInfo;
} else {
    puts "No errors.";
    puts "Warnings: ";
    puts "    [session_handle GetError]";
}

hwi CloseStack