//convert the image to grayscale
private void convertToGrayscaleToolStripMenuItem_Click(object sender, EventArgs e)
{
BitmapHelper ctImage = new BitmapHelper(ref img);
Pixel pixel, tmp=new Pixel(0, 0, 0 );
for (int i = 0; i < ctImage.getHeight(); i++)
{
for (int j = 0; j < ctImage.getWidth(); j++)
{
pixel = ctImage.getPixel(i, j);
tmp.Blue=tmp.Green = tmp.Red = Convert.ToInt32(pixel.Red * 0.299 + pixel.Green * 0.587 + pixel.Blue * 0.114);
ctImage.setPixel(i, j, tmp);
}
}
img = ctImage.getBitmap();
origImg.Dispose();
origImg = new Bitmap(img);
pictureBox.Image = img;
}
//make the image negative ( 255- R/G/B for each pixel )
private void negativeToolStripMenuItem_Click(object sender, EventArgs e)
{
BitmapHelper ctImage = new BitmapHelper(ref img);
Pixel pixel;
for (int i = 0; i < ctImage.getHeight(); i++)
{
for (int j = 0; j < ctImage.getWidth(); j++)
{
pixel = ctImage.getPixel(i, j);
pixel.Red = 255 - pixel.Red;
pixel.Green = 255 - pixel.Green;
pixel.Blue = 255 - pixel.Blue;
ctImage.setPixel(i, j, pixel);
}
}
img = ctImage.getBitmap();
origImg.Dispose();
origImg = new Bitmap(img);
pictureBox.Image = img;
}
