C#图像处理之霓虹效果实现方法
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2021-01-20
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C#图像处理之霓虹效果实现方法图像处理之霓虹效果实现方法
本文实例讲述了C#图像处理之霓虹效果实现方法。分享给大家供大家参考。具体如下：
//定义霓虹处理函数
public Bitmap PNihong(Bitmap a)
{
try
{
int w = a.Width;
int h = a.Height;
Bitmap dstBitmap = new Bitmap(w, h, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
System.Drawing.Imaging.BitmapData srcData = a.LockBits(new Rectangle
(0, 0, w, h), System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
System.Drawing.Imaging.BitmapData dstData = dstBitmap.LockBits(new Rectangle
(0, 0, w, h), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
unsafe
{
byte* pIn = (byte*)srcData.Scan0.ToPointer();
byte* pOut = (byte*)dstData.Scan0.ToPointer();
byte* p;
int stride = srcData.Stride;
for (int y = 0; y < h; y++)
{
for (int x = 0; x < w; x++)
{
//边缘八个点像素不变
if (x == 0 || x == w - 1 || y == 0 || y == h - 1)
{
pOut[0] = pIn[0];
pOut[1] = pIn[1];
pOut[2] = pIn[2];
}
else
{
int r0, r1, r2;
int g1, g2, g0;
int b1, b2, b0;
double vR, vG, vB;
//左上
p = pIn - stride - 3;
//右
p = pIn + 3;
r1 = p[2];
g1 = p[1];
b1 = p[0];
//正下
p = pIn + stride;
r2 = p[2];
g2 = p[1];
b2 = p[0];
//中心点
p = pIn;
r0 = p[2];
g0 = p[1];
b0 = p[0];
//使用模板
vR = Math.Sqrt((r0 - r1) * (r0 - r1) + (r0 - r2) * (r0 - r2));
vG = Math.Sqrt((g0 - g1) * (g0 - g1) + (g0 - g2) * (g0 - g2));
vB = Math.Sqrt((b0 - b1) * (b0 - b1) + (b0 - b2) * (b0 - b2));
if (vR > 0)
{
vR = Math.Min(255, vR);
}
else
{
vR = Math.Max(0, vR);
}
if (vG > 0)
{
vG = Math.Min(255, vG);
}
else
{
vG = Math.Max(0, vG);
}
if (vB > 0)
{
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