poIImagePlane SetColorAlphaTolerance

Sets the search tolerance for the target color that will be made transparent when the ColorAlpha image post-processing filter is active on the image plane.

Syntax

Imageplane_handle SetColorAlphaTolderance tolerance

Application

HyperView Tcl Modify

Description

The image plane offers several image post-processing filters that can be run on the image or video. The ColorAlpha filter makes the target color in the image or video transparent. This command specifies the search tolerance for the target color. This only applies when the filter mode is set to “equal”.

Inputs

tolerance
The search tolerance, specified as an integer that represents a tolerance percentage applied to the color value when searching.

Example

To create one image plane, and use the color alpha filter to remove all "white" from the image (making those areas of the image transparent), and then set the color search tolerance to 18%. 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

Errors

Returns HW_InvalidHandle if the image plane handle is invalid, or poIInvalidImgFilterMode if the specified filter mode is not recognized.