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POFast method for getting pixel color?
 

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  1. POFast method for getting pixel color?
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    <p>I'm working on a Photoshop plugin using c# (with Adobe Photoshop Object Library). I'm trying to loop through all the pixels in my active document, but with the code I currently have it takes a very long time to even go through 1 row of pixels in a 256x256 file. I was wondering if there might be a better (faster) way than using ColorSampler for this? (c++ plugin?)</p> <p>This is what I currently have: (<a href="http://forums.adobe.com/thread/290211" rel="nofollow noreferrer">http://forums.adobe.com/thread/290211</a>) (<a href="https://stackoverflow.com/questions/19177693/c-sharp-equivalent-to-this-code">C# Equivalent to this code</a>)</p> <pre><code>static void Main(string[] args) { ps.Application app = new ps.Application(); app.Preferences.RulerUnits = ps.PsUnits.psPixels; ps.Document activeDoc = app.ActiveDocument; double docWidth = activeDoc.Width; double docHeight = activeDoc.Height; double xPos = 0.0D; double yPos = 0.0D; activeDoc.ColorSamplers.RemoveAll(); var pixelLoc = new object[] { 0.0D, 0.0D }; ps.ColorSampler myColorSampler = activeDoc.ColorSamplers.Add(pixelLoc); var stopwatch = Stopwatch.StartNew(); ps.SolidColor myColor; double red; double green; double blue; for (xPos = 0.0D; xPos &lt;=docWidth - 1; xPos++) { myColor = myColorSampler.Color; red = myColor.RGB.Red; green = myColor.RGB.Green; blue = myColor.RGB.Blue; pixelLoc[0] = xPos; myColorSampler.Move(pixelLoc); } Console.WriteLine(stopwatch.ElapsedMilliseconds); //11000 ms for 1 row of 256 pixels Console.ReadLine(); } </code></pre>
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    1. USVincentC
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    1. COAre you declaring variables in your for loop? That might be part of the problem...
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      1. USOkuma.Scott
    2. COThanks! I've moved them out of the for loop and it did speed it up a bit (11000ms now - 13000ms before), I've edited my original post. But it's still very slow...
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      1. POFast method for getting pixel color?
      1. USVincentC
    3. COI would assume the loop itself is rather fast so there must be something inside that is causing it to be slow - maybe use the stop watch to profile each color call. I also notice that you are calling myColor.RGB every time - does storing this in a variable once make any difference? You could also try using Parallel.For to run the loop in a threaded manner :)
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      1. POFast method for getting pixel color?
      1. USGracelessROB
 

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