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POLinq instead two loops get pixel color and point from image
 

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  1. POLinq instead two loops get pixel color and point from image
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    <p>How can i use linq to list all pixels from image and process on them? For example we have:</p> <pre><code> for (int i = 0; i &lt; this.bitmap.Width; i++) { for (int j = 0; j &lt; this.bitmap.Height; j++) { bitmap.SetPixel(x, y, Color.FromArgb(1, 1, 1)); } } </code></pre> <p>Here i do not need list pixels because i work immediately using meanwhile for loops. However i am not sure if i can process image with linq like that. I understand that linq gain data so, i would like to take pixel from point and somehow store coorinates and color data of that pixel. I need that because how would i be able then make threshold?</p> <p>I tried to use struct but on page <a href="http://social.msdn.microsoft.com/Forums/is/linqtosql/thread/02154de8-ef32-4420-a3f6-e4e473df66ce" rel="nofollow">http://social.msdn.microsoft.com/Forums/is/linqtosql/thread/02154de8-ef32-4420-a3f6-e4e473df66ce</a> they said that linq doesn't work with struct.</p> <p>Maybe i should use list but when i wrote <code>List&lt;Point, Color&gt; list</code> i got error. So i really don't know how to do that..</p> <p>The all thing is about to optimalize my function under that text. I read in book called "effectice programming in c#" that using query syntax would be more readable than for loops..</p> <p>This is my code and i really ask you for a help how make it more readable code.</p> <p>ps. please correct topic if it is not good specified by me, sorry.</p> <blockquote> <p>private void ThreshGrayTails() {</p> <pre><code> this.tempBitmap = new Bitmap(this.bitmap); for (int i = 0; i &lt; this.bitmap.Width; i++) { for (int j = 0; j &lt; this.bitmap.Height; j++) { SetTempPixelInt(i, 0, j, 0, this.tempBitmap); if (this.tempPixelInt == 252 &amp;&amp; (j + 2) &lt; this.bitmap.Height &amp;&amp; (j - 2) &gt; 0) { SetTempPixelInt(i, 0, j, -1, this.bitmap); //if pixel above has value 252 if (this.tempPixelInt == 252) { SetTempPixelInt(i, 0, j, -2, this.bitmap); //if pixel above has value 159 if (this.tempPixelInt == 159) { SetTempPixelInt(i, 0, j, +1, this.bitmap); //if pixel under has value 0 or 172 if (this.tempPixelInt == 0 || this.tempPixelInt == 172) { this.tempBitmap.SetPixel(i, j, Color.FromArgb(255, 255, 255)); this.tempBitmap.SetPixel(i - 1, j, Color.FromArgb(255, 255, 255)); this.tempBitmap.SetPixel(i - 2, j, Color.FromArgb(255, 255, 255)); } } } } //if current pixel doesnt contain value in that list, turn it on black if (!colorsToThreshold.Contains(this.tempBitmap.GetPixel(i, j).R)) { Color newcolor = Color.FromArgb(0, 0, 0); this.tempBitmap.SetPixel(i, j, newcolor); } //if current pixel contain value in that list, turn it on white else { Color newcolor = Color.FromArgb(255, 255, 255); this.tempBitmap.SetPixel(i, j, newcolor); } } } this.bitmap = new Bitmap(this.tempBitmap); SaveImage("thresholded.bmp", this.bitmap); } private void SetTempPixelInt(int i, int pi, int j, int pj, Bitmap bitmap) { Color currentColor = bitmap.GetPixel(i + pi, j + pj); this.tempPixelInt = (int)(currentColor.R); } </code></pre> </blockquote>
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    1. USdeadfish
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    1. COWhy would you want to use LINQ for this? It seems that your current solution with loops fits the task much better.
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      1. POLinq instead two loops get pixel color and point from image
      1. USYakimych
 

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