C#

ImageAttributes ia = new ImageAttributes();
ColorMatrix cm = new ColorMatrix();
cm.Matrix33 = 0.5f; // half transparent
ia.SetColorMatrix(cm);

musefan wrote:

what about trying something with the TransparencyKey property of the form.

int[,] result = new int[2,array.GetLength(0)/2];
for (int i = 0; i < array.GetLength(0); i++)
{
   result[i&1,i/2] = array[1,i];
}

List<int> temp = new List<int>;
foreach (int i in array)
   temp.Add(i);
int[,] result = new int[2,tmp.Count/2];
for (int i = 0; i < temp.Count; i++)
  result[i&1,i/2] = temp[i];

List<int[]> temp = new List<int[]>();
for (int i = 0; i < array.GetLength(1); i++)
{
   if (array[0,i] != 1)
      temp.Add(new int[] { array[0,i], array[1,i] });
}
int[,] result = new int[2,temp.Count];
for (int i = 0; i < temp.Count; i++)
{
   result[0,i/2] = temp[i][0];
   result[1,i/2] = temp[i][1];
}