调整亮度对比度的图像和γ [英] Adjust brightness contrast and gamma of an image

问题描述

什么是一个简单的方法来调整亮度对比度.NET中的图像和γ

将发布自己的答案以后发现它。

解决方案

我已经找到了一个很好的和简单的例子<一href="http://blog.bee-eee.com/2008/01/23/c-adjusting-brightnesscontrast-and-gamma-of-an-image/">here

  

C＃和GDI +有一种简单的方式来控制的绘制颜色。   这基本上是一个嘉洛斯。它是一个5×5矩阵，它被施加到   每种颜色，如果它被设置。调整亮度只是执行   翻译的颜色数据，和对比度上执行比例   颜色。伽玛是一个完全不同的形式变换，但它包含   在ImageAttributes它接受嘉洛斯。

 位图originalImage;
位图adjustedImage;
浮动亮度= 1.0F; //亮度无变化
浮对比度= 2.0f; //两次对比
浮伽马= 1.0F; //伽玛无变化

浮adjustedBrightness =亮度 -  1.0F;
//创建矩阵，将照亮和对比图像
浮动[] [] ptsArray = {
        新的浮动[] {相反，0，0，0，0}，//规模红
        新的浮动[] {0，相反，0，0，0}，//规模的绿色
        新的浮动[] {0，0，相反，0，0}，//规模蓝色
        新浮法[] {0，0，0，1.0F，0}，//不具有可扩展阿尔法
        新浮法[] {adjustedBrightness，adjustedBrightness，adjustedBrightness，0,1}};

imageAttributes =新ImageAttributes（）;
imageAttributes.ClearColorMatrix（）;
imageAttributes.SetColorMatrix（新嘉洛斯（ptsArray），ColorMatrixFlag.Default，ColorAdjustType.Bitmap）;
imageAttributes.SetGamma（伽马，ColorAdjustType.Bitmap）;
图形G = Graphics.FromImage（adjustedImage）;
g.DrawImage（originalImage，新的Rectangle（0,0，adjustedImage.Width，adjustedImage.Height）
    ，0,0，originalImage.Width，originalImage.Height，
    GraphicsUnit.Pixel，imageAttributes）;
 

What is an easy way to adjust brightness contrast and gamma of an Image in .NET

Will post the answer myself to find it later.

解决方案

I've found a good and easy example here

c# and gdi+ have a simple way to control the colors that are drawn. It’s basically a ColorMatrix. It’s a 5×5 matrix that is applied to each color if it is set. Adjusting brightness is just performing a translate on the color data, and contrast is performing a scale on the color. Gamma is a whole different form of transform, but it’s included in ImageAttributes which accepts the ColorMatrix.

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 = 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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