Retrieve a pixel with Alpha set to 255, from a transparent image : BitmapData « Graphics « Flash / Flex / ActionScript






  1. Flash / Flex / ActionScript
  2. Graphics
  3. BitmapData

Retrieve a pixel with Alpha set to 255, from a transparent image

 

package{
  import flash.display.*;
  
  public class Main extends Sprite{
    public function Main(){

        var imgData:BitmapData = new BitmapData(20, 20, true, 0xFFFFFFFF);
        trace(imgData.getPixel32(0, 0));  // Displays: 4294967295
                                  // (original data was preserved)
    }
  }
}








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7.File BitmapData with Rectangle
8.Get pixel data from BitmapData
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10.getPixel32() Versus getPixel( )
11.Retrieving the Color of a Region of Pixels
12.Modifying a BitmapData
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14.Using BitmapData.lock( ) to improve performance
15.Assigning the Color of a Region of Pixels
16.How draw( ) handles Alpha channel values
17.Applying Color Transformations
18.Detecting Areas by Color
19.Adding Noise
20.Adding Perlin Noise
21.Updates the octaves parameter
22.The randomSeed parameter is responsible for the randomness of the noise
23.The following code makes a BitmapData object with Perlin noise, and then uses that object as a bitmap fill. Because the stitch parameter is false, the edges are visible as it tiles.
24.PerlinNoise animation