Converting bitmap to grayscale

Question

I want to convert an image from bitmap to grayscale, but when I load it in a picturebox...not on a button click event...
Like this...I load a bitmap picture and in the picturebox and it appears directly as a grayscale picture...
I found some source code on the Internet, but I don't really kmow how where to put the code to do what I want...
Thank you

Frogleg · Answer

Bitmap bmp; public Form1() { InitializeComponent(); } private void Form1_Load( object sender EventArgs e) { // loadImage();//use this to autoload } public void loadImage() { Image img = Image .FromFile( po.bmp ); bmp = new Bitmap (img.Width img.Height); Graphics g = Graphics .FromImage(bmp); g.DrawImage(img 0 0); pictureBox1.Image = ConvertToGrayscale(bmp); } public Bitmap ConvertToGrayscale( Bitmap source) { Bitmap bm = new Bitmap (source.Width source.Height); for ( int y = 0; y { for ( int x = 0; x { Color c = source.GetPixel(x y); int luma = ( int )(c.R * 0.3 + c.G * 0.59 + c.B * 0.11); bm.SetPixel(x y Color .FromArgb(luma luma luma)); } } return bm; } private void button1_Click( object sender EventArgs e) { loadImage(); } Try this. To load automatically uncomment // loadImage();//use this to autoload or put loadImage(); in open file dialog

luci marginean · Answer

Thank you verry much for you help...but I managed to make the program working last night... private void btnLoad_Click(object sender EventArgs e) { OpenFileDialog fDialog = new OpenFileDialog(); fDialog.Filter = Bitmaps |*.bmp| GIFs |*.gif| JPEGs |*.jpg;*.jpeg| TIFs |*.tif; fDialog.InitialDirectory = @C:\Documents and Settings\Taticu\Desktop\Scoala\Poze proba; if (fDialog.ShowDialog() == DialogResult.OK) { Image old = Image.FromFile(fDialog.FileName); pcbImage.Image = (Image)Grayscale(new Bitmap(old)); pcbImage.SizeMode = PictureBoxSizeMode.AutoSize; } } public static Bitmap Grayscale(Bitmap original) { Bitmap newBitmap = new Bitmap(original.Width original.Height); Graphics g = Graphics.FromImage(newBitmap); ColorMatrix colorMatrix = new ColorMatrix( new float[][] { new float[] {.3f .3f .3f 0 0} new float[] {.59f .59f .59f 0 0} new float[] {.11f .11f .11f 0 0} new float[] {0 0 0 1 0} new float[] {0 0 0 0 1} }); ImageAttributes attributes = new ImageAttributes(); attributes.SetColorMatrix(colorMatrix); g.DrawImage(original new Rectangle(0 0 original.Width original.Height) 0 0 original.Width original.Height GraphicsUnit.Pixel attributes); g.Dispose(); return newBitmap; }