我有一个1维的字节数组,有A,R,G和B的单独值,我知道预期图像的高度和宽度。如何编码此数据并将其另存为PNG?
答案 0 :(得分:2)
您可以使用位图和Bitmap.SetPixel()。
然后save the Bitmap as png使用ImageFormat.Png
。此外,您可能必须确保the Bitmap format maintains transparency。
(这里的其他答案比SetPixel更快。)
修改
也许WPF可以直接使用数组。 (我没有多少经验。)
答案 1 :(得分:2)
byte[] data = new byte[] {
255, 255, 000, 000, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 000, 000,
255, 255, 255, 255, 255, 255, 000, 000, 255, 255, 255, 255, 255, 255, 000, 000, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 000, 000, 255, 255, 255, 255, 255, 255, 255, 255,
255, 255, 255, 255, 255, 255, 000, 000, 255, 255, 255, 255, 255, 255, 000, 000, 255, 255, 255, 255,
255, 255, 000, 000, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 000, 000
};
Bitmap bmp = new Bitmap(5, 5);
for (int y = 0; y < 5; ++y)
for (int x = 0; x < 5; ++x)
{
int offset = y * 5 * 4 + x * 4;
bmp.SetPixel(x, y, Color.FromArgb(data[offset], data[offset + 1], data[offset + 2], data[offset + 3]));
}
bmp.Save(@"c:\tmp.png");
}
如果您的数组中的值以这种方式排序:B G R A B G R A B G R A ...您可以使用以下代码,它应该更快:
byte[] data = new byte[] {
// B G R A B G R A B G R A
0, 0, 255, 255, 0, 0, 0, 255, 0, 255, 0, 255,
0, 0, 0, 255, 0, 255, 0, 255, 255, 255, 255, 255,
0, 255, 0, 255, 0, 0, 0, 255, 255, 0, 0, 255
};
int width = 3;
int height = 3;
Bitmap bmp = new Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
var bitmapData = bmp.LockBits(new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height), System.Drawing.Imaging.ImageLockMode.WriteOnly, bmp.PixelFormat);
Marshal.Copy(data, 0, bitmapData.Scan0, data.Length);
bmp.UnlockBits(bitmapData);
bmp.Save(@"c:\tmp.png");
答案 2 :(得分:0)
使用Unsafe pointers
和LockBits
public unsafe Bitmap Retreive( byte [] values)
{
Bitmap bmp =new Bitmap(Width,Height);//enter your width and height here.
BitmapData bmData = bmp.LockBits(new System.Drawing.Rectangle(0, 0, bmp.Width,bmp.Height), System.Drawing.Imaging.ImageLockMode.ReadOnly, bmp.PixelFormat);
IntPtr scan0 = bmData.Scan0;
int stride = bmData.Stride;
int nWidth = bmp.Width;
int nHeight = bmp.Height;
for(int y=0;y<nHeight;y++)
{
//define the pointers inside the first loop for parallelizing
byte* p = (byte*)scan0.ToPointer();
p += y * stride;
for (int x = 0; x < nWidth; x++)
{
//fill as the values stored in you byte array;
p[0]=values[0];// R component.
p[1]=values[1];// G component.
p[2]=values[2];// B component.
p[3]=values[3];// Alpha component.
p += 4;
}
}
bmp.UnlockBits(bmData);
return bmp;
}
只需填写存储在数组中的p[]
值即可。
古德勒克。