Transparent Property

Summary

Gets or sets a value that indicates whether to use the transparent color.

Syntax

Objective-C

C++/CLI

Java

Python

public bool Transparent { get; set; }

@property (nonatomic, assign) BOOL isTransparent

public boolean getTransparentColor(); 
public void setTransparent( 
   boolean booleanValue 
);

public: 
property bool Transparent { 
   bool get(); 
   void set (    bool ); 
}

Transparent # get and set (RasterImage)

Property Value

true to use the transparent color; false, otherwise.

Remarks

The TransparentColor of a RasterImage is used when the Transparent property value is set to true.

Note, transparent paint does not work with RasterPaintEngine.Gdi. For more information, refer to RasterPaintProperties.

For more information, refer to PNG Files and Transparency.

Example

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 Leadtools.Svg; 
 
 
public void TransparentColorExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif"); 
	string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1_Transparent.gif"); 
 
	// Load the image 
	RasterImage image = codecs.Load(srcFileName); 
 
	// Change the image's palette to be Red and Blue 
	RasterColor[] redBluePalette = new RasterColor[2]; 
	redBluePalette[0] = RasterColor.FromKnownColor(RasterKnownColor.Red); 
	redBluePalette[1] = RasterColor.FromKnownColor(RasterKnownColor.Blue); 
	image.SetPalette(redBluePalette, 0, 2); 
 
	// make red the transparent color 
	image.Transparent = true; 
	image.TransparentColor = redBluePalette[0]; 
 
	// Save the image 
	codecs.Save(image, destFileName, RasterImageFormat.Gif, 8); 
 
	// Now load Ocr1_Transparent.gif in Internet Explorer. 
	// Notice how red is treated as a transparent color. 
	// You should get Blue text on a white background 
	//    (if IE's background color is white). 
 
	image.Dispose(); 
	codecs.Dispose(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS22\Resources\Images"; 
}

Requirements

Target Platforms

Reference

RasterImage Class

RasterImage Members

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Help Version 22.0.2023.5.16

Leadtools Assembly

Introduction

Getting Started

Namespaces

Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies