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

Kip Hackman · Answer

You can use LEADTOOLS Imaging Pro SDK technology in your application. https://www.leadtools.com/sdk/image-processing You can leverage the GrayscaleCommand class to convert an image to a grayscale image. Here is some sample code: using (RasterCodecs codecs = new RasterCodecs()) { string srcFileName = @ "FILE PATH TO INPUT IMAGE" ; string destFileName = @ "FILE PATH TO OUTPUT GRAYSCALE IMAGE" ; using (RasterImage image = codecs.Load(srcFileName, 24, CodecsLoadByteOrder.Bgr, 1, 1)) { // Convert to 8-bit grayscale GrayscaleCommand command = new GrayscaleCommand(); command.BitsPerPixel = 8; command.Run(image); codecs.Options.Jpeg.Save.QualityFactor = 2; codecs.Save(image, destFileName, RasterImageFormat.Jpeg, 8); } }

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; }