Converting a Grayscale image to black&white using Aforge.Net

c# image-processing grayscale aforge
Mr.Noob picture Mr.Noob · Jun 12, 2012 · Viewed 16.3k times · Source

I am quite new to Aforge.Net and I am looking for a way to convert a greyscale image to black and white. I couldnt really find any support on it?

I managed to convert a normal image to a GrayScale bye applying a Grayscale filter. but i couldnt find anything regarding the black and white converion

Can someone give me a hand with it please.

Answer

Sharkz picture Sharkz · Jun 13, 2012

Use the Threshold Class to convert the image to black and white.

 // create filter
Threshold filter = new Threshold( 100 );
// apply the filter
filter.ApplyInPlace( image );

Details of the Threshold Class can be found at Aforge.

The filter does image binarization using specified threshold value. All pixels with intensities equal or higher than threshold value are converted to white pixels. All other pixels with intensities below threshold value are converted to black pixels. The filter accepts 8 and 16 bpp grayscale images for processing. Note:Since the filter can be applied as to 8 bpp and to 16 bpp images, the ThresholdValue value should be set appropriately to the pixel format. In the case of 8 bpp images the threshold value is in the [0, 255] range, but in the case of 16 bpp images the threshold value is in the [0, 65535] range.

Related questions

Convert an image to grayscale

Is there a way to convert an image to grayscale 16 bits per pixel format, rather than setting each of the r,g and b components to luminance. I currently have a bmp from file. Bitmap c = new Bitmap("filename"); I …

Read More
converting a base 64 string to an image and saving it

Here is my code: protected void SaveMyImage_Click(object sender, EventArgs e) { string imageUrl = Hidden1.Value; string saveLocation = Server.MapPath("~/PictureUploads/whatever2.png") ; HttpWebRequest imageRequest = (HttpWebRequest)WebRequest.Create(imageUrl); WebResponse imageResponse = imageRequest.GetResponse(); Stream responseStream = imageResponse.GetResponseStream(); using (BinaryReader br = …

Read More
How to crop an image using C#?

How can I write an application that will crop images in C#?

Read More