Question

参数必须为正且小于高度。参数名: y"

private void 变换灰度ToolStripMenuItem_Click(object sender, EventArgs e)
{
Color c = new Color();
Bitmap b = new Bitmap(pictureBox1.Image);

int rr, gg, bb, cc;
for (int i = 0; i < pictureBox1.Width; i++)
{
for (int j = 0; j < pictureBox1.Height; j++)
{
c = b.GetPixel(i,j);
rr = c.B;
gg = c.G;
bb = c.B;
cc = (int)((rr + gg + bb) / 3);
if(cc<0)cc=0;
if (cc > 255) cc = 255;
Color c1=Color.FromArgb(cc,cc,cc);
b.SetPixel(i,j,c1);
}
pictureBox1.Refresh();
pictureBox1.Image = b;
}
}
想把图片变为灰色图片，但出现了问题，恳请
请各位帮忙~

Answer 1

for (int i = 0; i < b.Width; i++)
{
for (int j = 0; j < b.Height; j++)
{
循环体改成这样