c#和gdi +具有控制绘制颜色的简单方法。它基本上是一个ColorMatrix。如果设置了每种颜色,则将使用5×5矩阵。调整亮度只是对颜色数据执行转换,而对比度则对颜色进行缩放。 Gamma是一种完全不同的变换形式,但包含在接受ColorMatrix的ImageAttributes中。
Bitmap originalImage;
Bitmap adjustedImage;
float brightness = 1.0f; // no change in brightness
float contrast = 2.0f; // twice the contrast
float gamma = 1.0f; // no change in gamma
float adjustedBrightness = brightness - 1.0f;
// create matrix that will brighten and contrast the image
float[][] ptsArray ={
new float[] {contrast, 0, 0, 0, 0}, // scale red
new float[] {0, contrast, 0, 0, 0}, // scale green
new float[] {0, 0, contrast, 0, 0}, // scale blue
new float[] {0, 0, 0, 1.0f, 0}, // don't scale alpha
new float[] {adjustedBrightness, adjustedBrightness, adjustedBrightness, 0, 1}};
ImageAttributes imageAttributes = new ImageAttributes();
imageAttributes.ClearColorMatrix();
imageAttributes.SetColorMatrix(new ColorMatrix(ptsArray), ColorMatrixFlag.Default, ColorAdjustType.Bitmap);
imageAttributes.SetGamma(gamma, ColorAdjustType.Bitmap);
Graphics g = Graphics.FromImage(adjustedImage);
g.DrawImage(originalImage, new Rectangle(0,0,adjustedImage.Width,adjustedImage.Height)
,0,0,originalImage.Width,originalImage.Height,
GraphicsUnit.Pixel, imageAttributes);
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在.NET中调整图像的亮度对比度和伽玛值的简便方法是什么
我会自己发布答案,以便以后找到。