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I'm afraid there are better ways doing this, based on the power of the framework; in this case ColorMatrix is the tool to use. See e.g. here[^] (warning: make sure to use correct matrix elements, corresponding to the coefficients mentioned in the tip/trick).:)
You shouldn't rely on methods from the .NET classes (Bitmap::SetPixel, Bitmap::GetPixel, Color::FromArgb) in the inner loop as these are called intensively, million times per image, and their implementation are opaque to you.If their implementation is opaque to the compiler too, no code...
I would use the colormatrix for that... Look here under the grayscale methodhttp://pawjershauge.blogspot.com/2010/09/imagedrawing-extensions.html
A piece of warning, though: the LockBits method is not a transparent one, it does image format conversion before returning a pointer to the bitmap (this is why it has a PixelFormat argument). And conversely, the UnlockBits method converts back to the original format. My best guess is that when...
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