Fastest way to convert image to Black and white image

Question

Faris Shahin · Answer

LEADTOOLS toolkits can help you do this easily (Disclaimer: I work for LEAD). You can specify a region and then apply image processing operations on that region without affecting the remaining pixel data of the image. You can find more about specifying regions here: https://www.leadtools.com/help/leadtools/v19/dh/to/leadtools.topics~leadtools.topics.creatingaregion.html About converting the pixel data to black and white, you can use LEADTOOLS functions like IntensityDetectCommand Class. The code will look like this: --------------------------------------- IntensityDetectCommand _intensityDetectCommand = new IntensityDetectCommand(130, 255, RasterColor.White, RasterColor.Black, IntensityDetectCommandFlags.Master); void _viewer_MouseMove(object sender, MouseEventArgs e) { if (e.Button == System.Windows.Forms.MouseButtons.Left) { _viewer.Image.AddEllipseToRegion(null, new LeadRect(e.X - 30, e.Y - 30, 60, 60), RasterRegionCombineMode.Set); _intensityDetectCommand.Run(_viewer.Image); _viewer.Image.MakeRegionEmpty(); } _viewer.Refresh(); var g = _viewer.CreateGraphics(); g.DrawEllipse(new Pen(Color.Green, 3), new Rectangle(e.X - 30, e.Y - 30, 60, 60)); g.Dispose(); } ---------------------------------------  The result will look like this:

Piyush Vaishnavswami · Answer

Thanks Faris, That's i am searching but my client not effort LEADTOOLS he want free tool. Anybody have any idea.

Piyush Vaishnavswami · Answer

Thanks for reply. My problem is i want skip some portion, Try to explain in better word. I have one picture box and i wrote code in mouse_move event. Now user move mouse pointer that area need to covert in B/W. Sorry for my bad English. Thanks

Midhun Tp · Answer

Hi, Please refer below blogs- http://www.c-sharpcorner.com/blogs/convert-a-color-image-into-black-and-white-image1 http://notes.ericwillis.com/2009/11/make-an-image-black-and-white-in-csharp/

Delpin Susai Raj · Answer

http://www.photoshopessentials.com/photo-editing/black-and-white/fade-color/

Fastest way to convert image to Black and white image

Answers (5)