C#图像亮度调式与伪彩色图的处理教程(推荐)
时间:2020-12-02 12:31:06|栏目:.NET代码|点击: 次
如图,左图是效果,右图是原理,右图X轴代表图像一个像素点的灰度,Y轴代表RGB三个颜色对应的伪彩色图颜色。代码如下:
for (int y = 0; y < height; y++) { for (int x = 0; x < width; x++) { Color c = bmp.GetPixel(x, y); int R = c.R; int G = c.G; int B = c.B; byte temp = (byte)(B * 0.114 + G * 0.587 + R * 0.299); if (temp >= 0 && temp <= 63) { bmp.SetPixel(x, y, Color.FromArgb(0, (byte)(4 * temp), (byte)255)); } if (temp >= 64 && temp <= 127) { bmp.SetPixel(x, y, Color.FromArgb(0, 255, (byte)(510 - 4 * temp))); } if (temp >= 128 && temp <= 191) { bmp.SetPixel(x, y, Color.FromArgb((byte)(4 * temp - 510), 255, 0)); } if (temp >= 192 && temp <= 255) { bmp.SetPixel(x,y, Color.FromArgb(255, (byte)(1022 - 4 * temp),0)); } } }
图像亮度调整:
for (int y = 50; y < 100; y++) { for (int x = 50; x < 100; x++) { // 处理指定位置像素的亮度 Color c = b.GetPixel(x, y); int R = c.R; int G = c.G; int B = c.B; R = R + degree; if (R > 255) R = 255; G = G + degree; if (G > 255) G = 255; B = B + degree; if (B > 255) B = 255; b.SetPixel(x, y, Color.FromArgb(R, G, B)); } }//其中degree是亮度阶梯度