WP8图片处理(反色,灰度,柔化)

时间:2022-09-06 20:18:43

今天在做图片处理的时候没找到有多少关于wp8的图片处理,wp8.1的话因为API和window的一样了,处理按window来简单好多,而且也到处都是,所以就找了些资料,自己加了两个处理效果

1.灰度处理:

也就是将彩色变黑白效果,他的原理是:对每个像素点的RGB进行平均处理。下面我是使用了加权平均去算的

/// <summary>
/// 灰度处理
/// </summary>
private void GrayScale()
{
WriteableBitmap wb
= new WriteableBitmap(imageSource, null); //imageSource这个是image图片
WriteableBitmap wb_gray = new WriteableBitmap(wb.PixelWidth, wb.PixelHeight);

int[] ImageData = wb.Pixels;

for (int i = 0; i < wb.PixelHeight; i++)
{
for (int j = 0; j < wb.PixelWidth; j++)
{
int curColor = ImageData[i * wb.PixelWidth + j];

byte RedValue = (byte)(curColor >> 16 & 0xFF); //获取整形值
byte GreenValue = (byte)(curColor >> 8 & 0xFF);
byte BlueValue = (byte)(curColor & 0xFF);

byte GrayValue = (byte)(RedValue * 0.7 + GreenValue * 0.2 + BlueValue * 0.1);

byte[] GrayValueArr = new byte[4];
GrayValueArr[
3] = 0xFF; //0x00
GrayValueArr[2] = GrayValue;
GrayValueArr[
1] = GrayValue;
GrayValueArr[
0] = GrayValue;

//依次通过该数组,获取作为整数值的单个像素值,这些整数值计算为自左乘的 ARGB32。
int GrayPixel = BitConverter.ToInt32(GrayValueArr, 0);

unchecked
{
wb_gray.Pixels[i
* wb.PixelWidth + j] = GrayPixel; //OK->成功啦!!!
}

}
}
wb_gray.Invalidate();

imageC.Source
= wb_gray; //imageC这个是image图片
}

2.反色处理

原理:对每个像素点的RGB进行取反处理(就是用255去减)。

        private void inverse()
{
WriteableBitmap wb
= new WriteableBitmap(imageSource, null);
WriteableBitmap wb_gray
= new WriteableBitmap(wb.PixelWidth, wb.PixelHeight);

int[] ImageData = wb.Pixels;

for (int i = 0; i < wb.PixelHeight; i++)
{
for (int j = 0; j < wb.PixelWidth; j++)
{
int curColor = ImageData[i * wb.PixelWidth + j];

int RedValue = curColor >> 16 & 0xFF;
int GreenValue = curColor >> 8 & 0xFF;
int BlueValue = curColor & 0xFF;

byte[] GrayValueArr = new byte[4];
GrayValueArr[
3] = 0xFF; //0x00
GrayValueArr[2] = (byte)(255-RedValue);
GrayValueArr[
1] = (byte)(255-GreenValue);
GrayValueArr[
0] = (byte)( 255- BlueValue);

//依次通过该数组,获取作为整数值的单个像素值,这些整数值计算为自左乘的 ARGB32。
int GrayPixel = BitConverter.ToInt32(GrayValueArr, 0);

unchecked
{
wb_gray.Pixels[i
* wb.PixelWidth + j] = GrayPixel;
}

}
}

wb_gray.Invalidate();

imageC.Source
= wb_gray;
}

3.柔化处理

原理:当前像素点与周围像素点的颜色差距较大时取其平均值(这个也是看来的,个人感觉是取当前像素点颜色与周围的几个像素点颜色进行平均)

        private void Soften()
{
WriteableBitmap wb
= new WriteableBitmap(imageSource, null);
WriteableBitmap wb_gray
= new WriteableBitmap(wb.PixelWidth, wb.PixelHeight);

int[] ImageData = wb.Pixels;
//高斯模板,高斯一个很牛逼的人,大学数学书里到处都有他,人称“数学王子”,没错高斯定理就是这家伙的
int[] Gauss = { 1, 2, 1, 2, 4, 2, 1, 2, 1 };
for (int i = 0; i < wb.PixelHeight; i++)
{
for (int j = 0; j < wb.PixelWidth; j++)
{
int curColor = ImageData[i * wb.PixelWidth + j];

int r = 0;
int g = 0;
int b = 0;

int Index = 0;
for (int col = -1; col <= 1; col++)
for (int row = -1; row <= 1; row++)
{
int x = (i + col) < 0 || (i + col) > i ? i : i + col;
int y = (j + row) < 0 || (j + row) > j ? j : j + row;

curColor
= ImageData[x * wb.PixelWidth + y];
r
+= (curColor >> 16 & 0xFF) *Gauss[Index];
g
+= (curColor >> 8 & 0xFF) * Gauss[Index];
b
+= (curColor & 0xFF) * Gauss[Index];
Index
++;
}

byte[] GrayValueArr = new byte[4];
GrayValueArr[
3] = 0xFF; //0x00
GrayValueArr[2] = (byte)(r/16);
GrayValueArr[
1] = (byte)(g/16);
GrayValueArr[
0] = (byte)(b/16);

//依次通过该数组,获取作为整数值的单个像素值,这些整数值计算为自左乘的 ARGB32。
int GrayPixel = BitConverter.ToInt32(GrayValueArr, 0);

unchecked
{
wb_gray.Pixels[i
* wb.PixelWidth + j] = GrayPixel;
}
}
}

wb_gray.Invalidate();

imageC.Source
= wb_gray;
}

原本还想做其他效果的,比如锐化效果,雾化效果,这里先说说原理(都是看来的呀),

锐化效果:突出显示颜色值大(即形成形体边缘)的像素点(就是把像素点的RGB值都加大)

雾化效果:在图像中引入一定的随机值, 打乱图像中的像素值(随机改变每个像素点的大小)

上面说的锐化效果还比较好实现方法都差不多,但是雾化效果可以看看ImageTools,里面提供了ImageTools.Filtering(还没看怎么用,主要看点EditableImage这个应该可以实现),其他的什么变绿变蓝的效果把RGB值中对应的颜色改改就出来了