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RasterColor Structure

Summary
Describes a color consisting of relative intensities of alpha, red, green, and blue.
Syntax
C#
Objective-C
C++/CLI
Java
Python
[SerializableAttribute()] 
public struct RasterColor 
@interface LTRasterColor : NSObject <NSCopying, NSCoding> 
public final class RasterColor 
[SerializableAttribute()] 
public value class RasterColor : public System.ValueType  
class RasterColor: 
Remarks

The LEADTOOLS RasterColor class provides a platform independent representation of an ARGB color that can be used in any platform supported by LEADTOOLS such as GDI, GDI+, and WPF.

To convert a LEADTOOLS RasterColor object to/from a device dependent color, you can either use the various properties of methods of this class (such as the A, R, G, B properties and the RasterColor(int alpha, int red, int green, int blue) constructor) directly, or use the following helper classes:

In the Document and Medical toolkits, the COLORREF value can represent a 16-bit grayscale value if RasterImage is a 12- or 16-bit grayscale bitmap. To avoid confusion with an RGB value, set the COLORREF_GRAY16 mask (0x04000000). In this case (0x0400YYYY), the lower 16 bits (0xYYYY) of the COLORREF value represent the 16-bit grayscale value. (0x0400FFFF is 16-bit white and 0x04000000 is 16-bit black.) These are not standard Windows values. Therefore, although LEADTOOLS methods will recognize a COLORREF having this format, Windows methods will not.

Example
C#
using Leadtools; 
 
 
public void RasterColorArgbExample() 
{ 
   const int A = 128, R = 24, G = 87, B = 134; 
 
   // Create a RasterColor 
   RasterColor clr = new RasterColor(A, R, G, B); 
 
   // Make sure the color is correct 
   Assert.IsTrue(clr.A == A); 
   Assert.IsTrue(clr.R == R); 
   Assert.IsTrue(clr.G == G); 
   Assert.IsTrue(clr.B == B); 
 
   // The ARGB values represent real color components. This is NOT a palette index. 
   Assert.IsFalse(clr.IsPaletteIndex); 
 
   // Show its value 
   Console.WriteLine(clr); 
 
   // Show the A, R, G and B values 
   Console.WriteLine("Alpha value: " + clr.A); 
   Console.WriteLine("Red value: " + clr.R); 
   Console.WriteLine("Green value: " + clr.G); 
   Console.WriteLine("Blue value: " + clr.B); 
 
   // When the color is a palette index, the ARGB values are not color components 
   int index = 128; 
   RasterColor peletteIndex = RasterColor.FromPaletteIndex(index); 
   Assert.IsTrue(peletteIndex.IsPaletteIndex); 
   // The use the ToRGB method to obtain the index 
   Assert.IsTrue(peletteIndex.ToRgb() == index); 
} 
Requirements

Target Platforms

Help Version 23.0.2024.8.28
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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.