//返回表示深褐色度的矩阵
public static float[][] GetSepiaMatrix()
{
//如果先把图片变黑，深褐色会看上去更好一些，矩阵值(亮度和深褐色化的合并)
//可以被直接编码，在代码中保留它们为的是更易于修改
float[][] bright = GetBrightnessMatrix(-25);
//建立矩阵
float[][] sepia =
{
new float[] { Consts.GrayRed, Consts.GrayRed, Consts.GrayRed, 0, 0 },
new float[] { Consts.GrayGreen, Consts.GrayGreen, Consts.GrayGreen, 0, 0 },
new float[] { Consts.GrayBlue, Consts.GrayBlue, Consts.GrayBlue, 0, 0 },
new float[] { 0, 0, 0, 1, 0 },
new float[] { Consts.SepiaRed, Consts.SepiaGreen, Consts.SepiaBlue, 0, 1 }
};
return(PhotoHelper.CombineMatrix(bright, sepia));
}
// 该方法对图片应用所有的颜色操作，以提供一个更加自然的用户体验。
// 原始的操作顺序被忽略，方法中按照如下顺序对图片进行颜色操作：
// 1) 灰度转化和褐色转化
// 2) 对比度、亮度和饱和度调节
// 3) gamma参数调节
private void AdjustColor(ref Bitmap image)
{
int brightness = 0;
int contrast = 0;
int saturation = 0;
int gamma = 0;
ConvertColor convert = ConvertColor.None;
// 遍历操作列表找到每一个颜色操作的最后设定值
for (int i = 0; i <= (Global.ActionList.Count - 1); i++)
{
ActionItem item = Global.ActionList.GetAt(i);
switch (item.Action)
{
case PhotoAction.Brightness:
brightness = item.Percent;
break;
case PhotoAction.Contrast:
contrast = item.Percent;
break;
case PhotoAction.Saturation:
saturation = item.Percent;
break;
case PhotoAction.Gamma:
gamma = item.Percent;
break;
case PhotoAction.ConvertGrayscale:
convert = ConvertColor.Grayscale;
break;
case PhotoAction.ConvertSepia:
convert = ConvertColor.Sepia;
break;
}
}
// 执行颜色操作时更新进度条
Global.Progress.Update(this, "Applying actions", 1, Global.ActionList.Count);
// 只有当列表中还有一个或多个操作要执行时才更新
if (((convert != ConvertColor.None) ||
((contrast != 0) ||
((brightness != 0) ||
(saturation != 0)))))
{
// 矩阵默认值(单位矩阵)
float[][] matrix =
{
new float[] { 1, 0, 0, 0, 0 },
new float[] { 0, 1, 0, 0, 0 },
new float[] { 0, 0, 1, 0, 0 },
new float[] { 0, 0, 0, 1, 0 },
new float[] { 0, 0, 0, 0, 1 }
};
// 灰度转化和褐色转化
if ((convert == ConvertColor.Grayscale))
{
matrix = PhotoHelper.CombineMatrix(matrix, PhotoHelper.GetGrayscaleMatrix());
}
if ((convert == ConvertColor.Sepia))
{
matrix = PhotoHelper.CombineMatrix(matrix, PhotoHelper.GetSepiaMatrix());
}
// 对比度、亮度和饱和度调节
if ((contrast != 0))
{
matrix = PhotoHelper.CombineMatrix(matrix, PhotoHelper.GetContrastMatrix(contrast));
}
if ((brightness != 0))
{
matrix = PhotoHelper.CombineMatrix(matrix, PhotoHelper.GetBrightnessMatrix(brightness));
}
if ((saturation != 0))
{
matrix = PhotoHelper.CombineMatrix(matrix, PhotoHelper.GetSaturationMatrix(saturation));
}
// 对图片执行所有颜色操作
PhotoHelper.AdjustUsingCustomMatrix(ref image, matrix);
}
// gamma 参数调节，作为最后一个操作来执行
if ((gamma != 0))
{
PhotoHelper.AdjustGamma(ref image, gamma);
}
}