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POImproving Image compositing Algorithm c# .NET
 

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  1. POImproving Image compositing Algorithm c# .NET
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    <p>I was wondering if anyone could shed some light on improvements I can do in making this compositing algorithm faster. What is does is takes 3 images splits them up to get the 1st Images Red Channel, 2nd Images Green channel and the 3rd Images Blue channel and composites them together into 1 new image. Now it works but at an excruciatingly slow pace. The reason i think down to the pixel by pixel processing it has to do on all image components.</p> <p>The process is to : </p> <p>For all images: Extract respective R G and B values -> composite into 1 image -> Save new Image.</p> <pre><code>foreach (Image[] QRE2ImgComp in QRE2IMGArray) { Globals.updProgress = "Processing frames: " + k + " of " + QRE2IMGArray.Count + " frames done."; QRMProgressUpd(EventArgs.Empty); Image RedLayer = GetRedImage(QRE2ImgComp[0]); QRE2ImgComp[0] = RedLayer; Image GreenLayer = GetGreenImage(QRE2ImgComp[1]); QRE2ImgComp[1] = GreenLayer; Image BlueLayer = GetBlueImage(QRE2ImgComp[2]); QRE2ImgComp[2] = BlueLayer; Bitmap composite = new Bitmap(QRE2ImgComp[0].Height, QRE2ImgComp[0].Width); Color Rlayer,Glayer,Blayer; byte R, G, B; for (int y = 0; y &lt; composite.Height; y++) { for (int x = 0; x &lt; composite.Width; x++) { //pixelColorAlpha = composite.GetPixel(x, y); Bitmap Rcomp = new Bitmap(QRE2ImgComp[0]); Bitmap Gcomp = new Bitmap(QRE2ImgComp[1]); Bitmap Bcomp = new Bitmap(QRE2ImgComp[2]); Rlayer = Rcomp.GetPixel(x, y); Glayer = Gcomp.GetPixel(x, y); Blayer = Bcomp.GetPixel(x, y); R = (byte)(Rlayer.R); G = (byte)(Glayer.G); B = (byte)(Blayer.B); composite.SetPixel(x, y, Color.FromArgb((int)R, (int)G, (int)B)); } } Globals.updProgress = "Saving frame..."; QRMProgressUpd(EventArgs.Empty); Image tosave = composite; Globals.QRFrame = tosave; tosave.Save("C:\\QRItest\\E" + k + ".png", ImageFormat.Png); k++; } </code></pre> <p>For reference here is the red channel filter method relatively the same for blue and green:</p> <pre><code>public Image GetRedImage(Image sourceImage) { Bitmap bmp = new Bitmap(sourceImage); Bitmap redBmp = new Bitmap(sourceImage.Width, sourceImage.Height); for (int x = 0; x &lt; bmp.Width; x++) { for (int y = 0; y &lt; bmp.Height; y++) { Color pxl = bmp.GetPixel(x, y); Color redPxl = Color.FromArgb((int)pxl.R, 0, 0); redBmp.SetPixel(x, y, redPxl); } } Image tout = (Image)redBmp; return tout; } </code></pre>
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    1. USGelion
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    1. COGetPixel() is slooooow: http://stackoverflow.com/questions/4235731/is-there-a-faster-alternative-to-gdi-getpixel
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      1. POImproving Image compositing Algorithm c# .NET
      1. USMitch Wheat
    2. COpossible duplicate of [.DrawImage with opacity?](http://stackoverflow.com/questions/5519956/drawimage-with-opacity)
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      1. POImproving Image compositing Algorithm c# .NET
      1. USHans Passant
 

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