CanvasCommand Class

Summary

Combines two images, superimposing one image on another image that is used like a canvas. This command is available in the Imaging and above toolkits.

Syntax

C++/CLI

Python

public class CanvasCommand : RasterCommand

public ref class CanvasCommand : public RasterCommand

class CanvasCommand(RasterCommand):

Remarks

CanvasCommand combines two images, superimposing one image on another image that is used like a canvas.

As an example, if you use the following figure:

And you use the following figure as the canvas image:

And you call CanvasCommand using the following values:

Parameter	Value
Transparency	90
Emboss	117
XOffset	0
YOffset	0
Flags	CanvasCommandFlags.TileShift
TilesOffset	0

The following figure results:

In the following figure the rafting image has been combined with the canvas image using the same values, except that the CanvasCommandFlags.TileFit flag is used and so instead of tiling the canvas image has been stretched to fit the dimensions of the rafting image:
Other commands that allow you to combine images include:

BumpCommand

CombineCommand

CombineWrapCommand

TextureAlphaBlendCommand

UnderlayCommand

For more information on this and other commands that can be used to combine images, Refer to Introduction to Image Processing With LEADTOOLS.
This command supports 12-bit and 16-bit grayscale and 48-bit and 64-bit color images. Support for 12-bit and 16-bit grayscale and 48-bit and 64-bit color images is available only in the Document/Medical toolkits.
This command does not support signed data images.
This command does not support 32-bit grayscale images.

For more information Refer to Applying Artistic Effects.

Canvas Function - Before

Canvas Function - After

View additional platform support for this Canvas function.

Example

This procedure run a CanvasCommand of the image using canvasImage.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.SpecialEffects; 
 
 
public void CanvasCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "cannon.jpg")); 
   RasterImage canvasImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "ULAY1.BMP")); 
 
   // Prepaire the command 
   CanvasCommand canvasCommand = new CanvasCommand(); 
   canvasCommand.CanvasImage = canvasImage; 
   canvasCommand.Emboss = 100; 
   canvasCommand.Transparency = 100; 
   canvasCommand.XOffset = 10; 
   canvasCommand.YOffset = 10; 
   canvasCommand.TileOffset = 20; 
   canvasCommand.Flags = CanvasCommandFlags.TileShift; 
 
   // Apply the command 
   canvasCommand.Run(image); 
   codecs.Save(image, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24); 
 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}