Combines two images so that one appears to be an underlying texture for the other.
public void Underlay(
RasterImage underlayImage,
RasterImageUnderlayFlags flags
)
Public Sub Underlay( _
ByVal underlayImage As RasterImage, _
ByVal flags As RasterImageUnderlayFlags _
)
- (BOOL)underlay:(LTRasterImage *)underlayImage
flags:(LTRasterImageUnderlayFlags)flags
error:(NSError **)error
public void underlay(
RasterImage underlayImage,
RasterImageUnderlayFlags flags
)
public:
void Underlay(
RasterImage^ underlayImage,
RasterImageUnderlayFlags flags
)
underlayImage
The image that will be used as the underlying image. This is the image that appears to be on bottom and is grayscaled as it is combined with the target image.
flags
Indicators of how the underlying image is to be positioned.
This is most effective when the underlying image is a filtered one, such as an embossed image.
This method changes the colors of the underlay to grayscale as it combines the images. It updates this RasterImage, leaving the underlayImage unchanged. underlayImage can either be stretched or tiled to fill the image, as shown in the following illustration:
For more information, refer to Introduction to Image Processing With LEADTOOLS.
For more information, refer to Applying Artistic Effects.
This example draws an ellipse on the image.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Dicom;
using Leadtools.Drawing;
using Leadtools.Controls;
using LeadtoolsExamples.Common;
using Leadtools.Svg;
public void UnderlayExample()
{
RasterCodecs codecs = new RasterCodecs();
RasterImage image = codecs.Load(Path.Combine(ImagesPath.Path, "IMAGE1.CMP"));
// Load underlay image
RasterImage underlayImage = codecs.Load(Path.Combine(ImagesPath.Path, "ULAY1.BMP"));
// Use underlayImage as a tiled underlay for image
image.Underlay(underlayImage, RasterImageUnderlayFlags.None);
codecs.Save(image, Path.Combine(ImagesPath.Path, "IMAGE1_underlay.BMP"), RasterImageFormat.Bmp, 0);
image.Dispose();
underlayImage.Dispose();
codecs.Dispose();
}
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Controls
Imports Leadtools.Dicom
Imports Leadtools.Drawing
Imports Leadtools.Svg
Public Sub UnderlayExample()
Dim codecs As RasterCodecs = New RasterCodecs()
Dim image As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1.CMP"))
' Load underlay image
Dim underlayImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "ULAY1.BMP"))
' Use underlayImage as a tiled underlay for image
image.Underlay(underlayImage, RasterImageUnderlayFlags.None)
codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "IMAGE1_underlay.BMP"), RasterImageFormat.Bmp, 0)
image.Dispose()
underlayImage.Dispose()
codecs.Dispose()
End Sub
Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
c#[Silverlight C# Example]
using Leadtools;
using Leadtools.Codecs;
using Leadtools.Dicom;
using Leadtools.ImageProcessing;
using Leadtools.ImageProcessing.Core;
using Leadtools.ImageProcessing.Color;
using Leadtools.Examples;
using Leadtools.Windows.Media;
public void UnderlayExample(RasterImage image, RasterImage underlayImage, Stream destStream)
{
// Use underlayImage as a tiled underlay for image
image.Underlay(underlayImage, RasterImageUnderlayFlags.None);
RasterCodecs codecs = new RasterCodecs();
codecs.Save(image, destStream, RasterImageFormat.Bmp, 0);
image.Dispose();
underlayImage.Dispose();
}
vb[Silverlight VB Example]
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.Dicom
Imports Leadtools.ImageProcessing
Imports Leadtools.ImageProcessing.Core
Imports Leadtools.ImageProcessing.Color
Imports Leadtools.Windows.Media
Public Sub UnderlayExample(ByVal image As RasterImage, ByVal underlayImage As RasterImage, ByVal destStream As Stream)
' Use underlayImage as a tiled underlay for image
image.Underlay(underlayImage, RasterImageUnderlayFlags.None)
Dim codecs As RasterCodecs = New RasterCodecs()
codecs.Save(image, destStream, RasterImageFormat.Bmp, 0)
image.Dispose()
underlayImage.Dispose()
End Sub
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