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December 26, 2018 17:39
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C# Convert Image Grayscale
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// source: https://stackoverflow.com/a/3054357/826308 | |
public static Image ConvertToGrayscale(Image image) | |
{ | |
Image grayscaleImage = new Bitmap(image.Width, image.Height, image.PixelFormat); | |
// Create the ImageAttributes object and apply the ColorMatrix | |
ImageAttributes attributes = new System.Drawing.Imaging.ImageAttributes(); | |
ColorMatrix grayscaleMatrix = new ColorMatrix(new float[][]{ | |
new float[] {0.299f, 0.299f, 0.299f, 0, 0}, | |
new float[] {0.587f, 0.587f, 0.587f, 0, 0}, | |
new float[] {0.114f, 0.114f, 0.114f, 0, 0}, | |
new float[] { 0, 0, 0, 1, 0}, | |
new float[] { 0, 0, 0, 0, 1} | |
}); | |
attributes.SetColorMatrix(grayscaleMatrix); | |
// Use a new Graphics object from the new image. | |
using (Graphics g = Graphics.FromImage(grayscaleImage)) | |
{ | |
// Draw the original image using the ImageAttributes created above. | |
g.DrawImage(image, | |
new Rectangle(0, 0, grayscaleImage.Width, grayscaleImage.Height), | |
0, 0, grayscaleImage.Width, grayscaleImage.Height, | |
GraphicsUnit.Pixel, | |
attributes); | |
} | |
return grayscaleImage; | |
} |
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