Thread: Get pixel values from pic

Hi. I wrote some code for getting pixel values from picture.
What exactly is this values? Can i get this values but like circle....? Start from the centre then go up then right and...
like that. Its possible that?
My code is:
for(i=0;i<y;i++)
for(j=0;j<x;j++)
pin[i][j]=Image1->Canvas->Pixels[i][j];

x and y is the size of pic...
The values i get is from start of pics and i want cirlce and get from centre of pic first