Detailed explanation of C# image grayscale conversion
Converting images to grayscale format is a common image processing task. This article will explore how to use the System.Drawing.Imaging.PixelFormat enumeration to implement grayscale conversion in C#.
16-bit pixel grayscale format
If you need a grayscale image with 16-bit pixels, you can use the following constructor:
Bitmap grayScaleBP = new System.Drawing.Bitmap(2, 2, System.Drawing.Imaging.PixelFormat.Format16bppGrayScale);
Image grayscale conversion
To convert an existing image (c) to a grayscale image (d) you can use the following code:
Bitmap d;
int x, y;
// 循環(huán)遍歷圖像像素并將其顏色重置為灰度
for (x = 0; x < ...; x++) {
for (y = 0; y < ...; y++) {
// 灰度轉(zhuǎn)換邏輯...
}
}
(The specific grayscale conversion code in the loop body is omitted here because the original text does not provide complete loop body content)
Faster grayscale conversion method
The following is a more efficient method of image grayscale conversion:
public static Bitmap MakeGrayscale3(Bitmap original)
{
Bitmap newBitmap = new Bitmap(original.Width, original.Height);
using (Graphics g = Graphics.FromImage(newBitmap))
{
// 創(chuàng)建灰度ColorMatrix
ColorMatrix colorMatrix = new ColorMatrix(
new float[][]
{
new float[] {.3f, .3f, .3f, 0, 0},
new float[] {.59f, .59f, .59f, 0, 0},
new float[] {.11f, .11f, .11f, 0, 0},
new float[] {0, 0, 0, 1, 0},
new float[] {0, 0, 0, 0, 1}
});
// 使用灰度ColorMatrix繪制原始圖像
g.DrawImage(original, new Rectangle(0, 0, original.Width, original.Height),
0, 0, original.Width, original.Height, GraphicsUnit.Pixel,
new ImageAttributes { ColorMatrix = colorMatrix });
}
return newBitmap;
}
This method uses ColorMatrix to perform grayscale conversion, thus improving performance.
The above is the detailed content of How to Convert Images to Grayscale in C#?. For more information, please follow other related articles on the PHP Chinese website!
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