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PremultiplyAlpha Property

Summary

Indicates whether LEADTOOLS should premultiply the alpha values when loading the image data.

Syntax
C#
VB
Java
Objective-C
C++
public bool PremultiplyAlpha { get; set; } 
Public Property PremultiplyAlpha As Boolean 
@property (nonatomic, assign) BOOL premultiplyAlpha 
public boolean getPremultiplyAlpha() 
public void setPremultiplyAlph(boolean value) 
public: 
property bool PremultiplyAlpha { 
   bool get(); 
   void set (    bool ); 
} 

Property Value

true to premultiply the alpha values when loading the image data, false to load the image data as it is stored in the file.

The default value for this property is false in .NET.

Remarks

This property is only used when loading PNG and PSD files that have alpha information.

When loading images for display purposes on platforms that expect image data to be in premultiplied alpha format, setting this property to true will result in proper image display (i.e. the transparency information will preserved).

When loading images for image processing purposes setting this property to false will load the image data as it is actually stored in the input file, for proper pixel data manipulation. You can then convert the image data to premultiplied alpha format for display using PremultiplyAlphaValuesCommand.

Requirements

Target Platforms

Help Version 20.0.2019.9.19
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