coversion of image into pixel matrix [modified]

[rohan4040]

How can i convert a color image into pixel matrix using c#.net

modified on Wednesday, March 4, 2009 1:44 AM

[Pete OHanlon]

rohan4040 wrote:

How can i convert a color image into pixel matrix

By writing code - in the language of your choice.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

My blog | My articles | MoXAML PowerToys

[annathor]

a slow but easy way to do this is to use the Bitmap class' GetPixel method. I am writing this code as I go and will probably contains error:

class ByteColor
{
public byte R;
public byte G;
public byte B;
}

Bitmap myBMP=new Bitmap("myimage.jpg");
int iW=myBMP.Width;
int iH=myBMP.Height;
ByteColor[,] myPixelMatrix=new ByteColor[iW,iH];

for(int w=0; w<iw;w++)>
{
for(int h=0; h<ih;h++)>
{
Color tmpColor=myBMP.GetPixel(w,h);

 byte cR=Convert.toByte(tmpColor.R);
 byte cG=Convert.toByte(tmpColor.G);
 byte cB=Convert.toByte(tmpColor.B);

 myPixelMatrix\[w,h\].R=cR;
 myPixelMatrix\[w,h\].G=cR;
 myPixelMatrix\[w,h\].B=cR;

}
}

As I said this is a easy but slow way to do it. for some more speed you can use the LockBits and UnlockBits methodes and copy the byte array right from memory like this:

Rectangle rect = new Rectangle(0, 0, myBMP.Width, myBMP.Height);
BitmapData ImageColorData = myBMP.LockBits(rect, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);

unsafe
{
IntPtr pointer = ImageColorData .Scan0;
int Bytesnmpr = ImageColorData .Stride * myBMP.Height;
byte[] ColorValues = new byte[Bytesnmpr];
Marshal.Copy(pointer, ColorValues , 0, Bytesnmpr);

for (int i= 0; i< ColorValues .Length; i++) 
{
    //copy the byte to your buffer or do what you want with it here
}

Marshal.Copy(ColorValues , 0, pointer , Bytesnmpr);

}
myBMP.UnlockBits(ImageColorData);

this one is much faster but uses unsafe code. also remember, I worte the code on the fly, so there is most likely errors in this code

[led mike]

If you had magnified between the lines of his post like times 100 you would have seen: "Send me the codes pleezzzzz, it's urgent"

[Pete OHanlon]

I urgently ignored the subtext.

"WPF has many lovers. It's a veritable porn star!" - Josh Smith

As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.

My blog | My articles | MoXAML PowerToys

[rohan4040]

is this coding related to c#.net or any other form of coding?